Pizza Hut has a very lucrative deal with Code Geass: Lelouch of the Rebellion. While Humongous Mecha and Magical Eyes battle it out, Pizza Hut signs are in every episode and the cast eat pizza every chance they get. This gets slowly phased out over the course of the series, but one element sticks around up to the very last scene of the series: C.C.'s prized possession is a plush of Cheese-Kun, Pizza Hut's mascot in Japan. The Pizza Hut logos are censored out in the American release because, according to a Bandai rep, Pizza Hut wasn't too hot on the idea of sponsoring a show whose protagonist is a vengeance-minded terrorist. Cheese-Kun remains unedited, presumably because the only Americans who know what it is are Geass fans who watched the show subbed.
This is particularly impressive given that the show takes place in an alternate universe where the American Revolution failed and the Americas became the seat of a new absolutist British Empire after Napoleon kicked them out of the British Isles. Societies may change, civilizations may rise or fall, culture can vary radically, but evidently, Pizza Hut is the one eternal constant.
The series also had a somewhat strange placement of Soproni Kékfrankos, a Hungarian wine (even mentioned in dialog). While the name of the wine is completely correct right down to accent, the name of the producer and Hungary itself is a bit misspelled. Leaving us to wonder if it is a real Product Placement or just a particularly careful Bland-Name Product.
There are very prominent Biglobe logos (the leading Japanese ISP) where people are surfing the web. This wasn't translated in the dub and so flew right over the American's heads.
Darker Than Black features numerous advertisements for @Nifty, the ISP which originally streamed the episodes online. It also has the occasional Coca Cola logo as well. Like in several other series, Pizza Hut appears here and there (replaced by "Pizza Slice" in the English dub).
The computer through which L communicates in Death Note is a Mac, although the apple logo is never actually visible. Likewise, Light's computer isn't explicitly identified but is recognizable as a Mac G4. Since the series was set Twenty Minutes into the Future, it's a bit out of date now.
Speaking of Biglobe, some (authentic looking!) computer screen closeups in the Digimon Adventuremovie show Koushiro very obviously using that particular ISP to get online.
While the original TV series was very big on Brand X products, the Rebuild movies often have shot-for-shot recreations of scenes from the show. So scenes that originally had generic pizza boxes and soda cans in the background now have Pizza Hut and Pepsi logos plastered everywhere.
The movies are chock full of it, with Pizza Hut (again!), Pepsi, Doritos, Yebisu beer (not Yebichu), and UCC Coffee (whew!). Most of these have accompanying packaging advertising the movie as well.
In the second movie, there is a Lawson Convenience Store inside Nerv Headquarters. Asuka also uses a WonderSwan-brand handheld gaming console.
The third movie mostly averts this, except for Kaworu's piano, which is made by Yamaha. There's even a lingering shot where we clearly see the logo.
In Eyeshield21, Hiruma is usually seen toting around a laptop. In some places, it is revealed to be a Sony Vaio.
In an omake for the manga Fairy Tail there is, pretty bizarrely considering this is an entirely Fantasy Constructed World, a blatant part of product placement at the end where Grey hands the two of them a bottle of Coca-Cola. Yeah, it's just weird.
The anime OVA was sponsored by Nissin Foods as part of an anniversary promotion — and apparently the only food available to the colonists on the moon is Cup Noodles.
When the action shifts to post-apocalyptic Earth, the only food available there is Cup Noodles too... but they have Seafood flavor! This leads to some serious Fridge Logic: are the people on Earth eating 200 year old Cup Noodles? If not, are there Nissin factories still operating on Earth even though everyone's dirt-poor? Since the dystopian government on the Moon is trying to uphold the Masquerade that everyone on Earth is dead, do the Earth and Moon branches of Nissin have any contact with each other? Or is Nissin part of the whole conspiracy in the first place?
At one point in the movie, a computer boots up and we get a few good seconds devoted to the startup screen for Windows 95. They even used the Windows 95 startup noise. See for yourself.
Not only Windows 95, but the computer's blatantly a NEC PowerMate (for the uninitiated, NEC was the creator of the TurboGrafx-16, and it's semiconductor business fabricated CPUs for Sega back in the 32x, Saturn and Dreamcast days). They also made desktop computers and notebooks up until recently, when they decided to discontinue these to focus on the server and supercomputing sector.
Pizza Hut sponsored it, complete with official art of the cast enjoying some delicious pizza. Nana Mizuki, Fate's voice actress, even ordered a delivery just to collect a limited time offer special pizza box... with Fate Testarossa on the cover.
A scene in has Nanoha, Alyssa, and Suzuka playing a generic JRPG, before switching it out for a few rounds of Wii Sports. It was Tennis, for those wondering.
When Negi's party was scattered during Magic World arc, one of the few things that Chisame was able to bring with her was a CalorieMate Block she put in her robe.
An in-story example: During the Battle of Mahora, (which almost all the students think is just a game), Chao, the arc's Big Bad pops up on the giant screens to do some Evil Gloating. After which she does an ad for the restaurant she manages.
And Pizza Hut strikes again in the 4th season of Maria-sama ga Miteru, where the logo is often prominently displayed in the background, even in an amusement park.
An episode of Nichijou contains a joke where the punchline involves Hakase encouraging Nano to bring along a Snickers bar as a snack in school.
Yamaha is one of the main sponsors of Nodame Cantabile. Consequently, every piano in that show is a Yamaha and melodicas are referred to as "pianicas".
Ouran High School Host Club not only uses Bland Name Products (most of which are seen in the anime), but in the manga we see Kyouya using an Apple computer with the proper OS displayed on the screen. He even has a few recognizable icons such as Skype.
In the anime, James occasionally has a set of reference cards if Team Rocket happens upon a new Pokémon. When 4Kids still had the dub of the anime, they'd sometimes cut these scenes out because of potential advertisement for the Pokémon TCG. Sometimes they would just remove the borders on the cards to make them look less like the real world TCG cards.
While on the topic of the 4Kids dub, this kind of editing got really stupid in the Advanced Generation. Most any things which had a picture of a Poké Ball on them were painted out (the ones on Ash's Hoenn Badge case and May's Ribbon cases were turned into red stripes). Oddly enough, this only seemed to happen in the US/Kids WB! airings; most international dubs didn't feature that censorship.
However, there's an even bigger product placement in two Sinnoh episodes—one has Meowth use a Wii Remote, and the other the Nunchuck attachment!
Sunrise makes the list again. Sora O Kakeru Shoujo had logos of its toy and music companies flying by in the first few episodes, but then comes episode 14. There's a long scene of Nina, Bou and Min eating at a Pizza Hut, with the logo in the dead center of the screen.
Mai Kujaku (Mai Valentine in the English versions) drinks Pepsi in one episode of Yu-Gi-Oh!. The reference was taken out in the American version. Starbucks coffee has also appeared. Many cards in Yu-Gi-Oh also happen to be shameless promotions for Konami games (Konami owns the rights to Yu-Gi-Oh) such as Castlevania, Gradius, Contra and even Metal Gear Solid.
In the first episode of Haiyore! Nyarko-san, Nyarko drags Mahiro to a bookstore where several manga and light novels published by GA Bunko (who publishes Nyarko-san itself) show up. You can also see posters advertising Nyarko-san, specifically its anime adaptation — which you're currently watching.
Similarly Gintama has had entire plots revolving around Jump. The series is so weird this gets a pass though.
Jotaro's life was saved by copies of Jump, before either of those comics existed.
The most recent translation, by Viz comics, of Read or Die had Yomiko using Jumpin battle (and pausing to read them). It was hard to read the katakana, though, so it might have been Jump, or possibly Corocoro Comics, a rival.
Superheroes have become a major entertainment industry in Tiger & Bunny, and the heroes themselves are covered in advertisements for real-life products. There's even a commercial spot for Pepsi NEX featuring Blue Rose which blurs the line between Ad Bumper and ad. On the other hand, several characters are represented by fictional companies. The characters get yelled at fairly frequently by their sponsors for causing collateral damage (which the sponsors pay for) and get criticized for heroics off the air as it means they don't get any advertisement time.