The term "New Media" itself was first used in the late 1990s by media companies to describe their then-new divisions producing or repackaging content for the Internet. It's been 15-20 years since then, during which time the Internet has for some of them become the dominant or even only medium.
TV Tropes, which now covers video games, movies, comic books, literature and more.
And with features such as Useful Notes, and subject pages that completely lack tropes, it's become more akin to Everything2 than anything its title would suggest. There have been efforts to curtail it
Prior to its rename to Trope Launch Pad, the "You know that thing where" page was titled around the idea that the person posting the trope idea needs help gathering a title or examples for the trope ("You know that thing where this happens? What should we call that?"), but it's currently used as a general vetting procedure for all new trope ideas, even ones where the person posting the idea already has a good title in mind and a number of examples. It can also be used for works and indexes.
The pmwiki part in any URL on this site. TV Tropes used to use an early version of PmWiki code, but has been developed and rewritten to the point where it is entirely separate.
The Permanent Red Link Club was called that because all links that were listed there were doomed to be permanently red. Now that links show up as blue as long as an article of a given title exists in any namespace, several PRLC members, most commonly subpages and former Main namespace redirects, are actually blue.
All-Blue Entry becomes this if you happen to be using the "Night Vision" feature, which renders links green for greater visibility on a black background.
"Crowners" are called that because they were originally developed to determine which Moment of Awesome was the crowning moment of awesome, before the userbase collectively realized that awesomeness was simply too subjective to reliably choose the most awesome moment and dropped that requirement. In the meantime, it was noticed that they made an awfully handy tool for just about any conceivable thing that might need to be voted on, and now they're used for just about everything except their original purpose.
dennogumi.org was once a fansite about Cyber Team in Akihabara (Akihabara Denno Gumi). The webmaster then converted the domain into his personal blog in which he writes primarily about Linux and practically nothing about said anime.
When FiveMinute.net was first created, it was called Five-Minute Voyager because the only fivers were of episodes of Star Trek: Voyager. As the years went on and the scope increased, there were occasional efforts to rename. Even after the site moved to a new domain under its current title you'd still find more people calling it 5MV than 5M.net. Eventually Zeke gave up, and you're allowed to use 5MV again. He explains (links to TV Tropes pages not in the original)...
deviantART: The Media Watch Dogs are hitting the site so hard that it's no longer "deviant". Also features a Group system where groups might not be art related. This has led several people to switch over to FurAffinity, despite the fact that they don't even draw furry art. The website also allows one to write pieces of literature. In fact, some members don't even post pieces of art at all, instead, opting to post stories, poems, etc.
Anime Feet is a blog, about, well Anime Feet (Of girls, that is). It soon drifted to more of "Animated Feet" as it included Avatar: The Last Airbender or Justice League Unlimited, though that was still somewhat close to the original idea (Especially since the former is animesque), moreso compared to.... COSPLAYER FEET, which aren't even animated at all! And while some did cosplay as anime characters, there was stuff such as Lara Croft or even an Original Character. The cosplaying wasn't an one-off thing, it was the only thing posted for one month (During which the page had the subtitle "Cosplayers rule!", almost lampshading its decay). They even had another month dedicated to the actresses of the Harry Potter movies, which couldn't get further from anime if they tried. One wonders why they just don't change their name to "Female Feet", as outside the top banner there's been barely any anime feet whatsoever in a long time. To be exact, for the eight first months of 2011 they only had TWO updates featuring actual anime feet, and none by the site owner himself. In fact, the owner doesn't seem to care much about the artifact-ness, as in an update he said cheerfully he now posted a large variety of female feet from various mediums and while he listed stuff like film or comic books, he didn't list anime. (Well, it was included as part of "various animated feet", but the fact he couldn't even mention it standalone despite being the blog's name is kinda sad).
Likewise, The Internet Movie Plane Database, which includes appearances of its subject matter (airplanes) in other media that isn't movies, and any other similar sites.
The Internet Movie Database has pages on TV shows, shorts, and video games.
Online radios sometimes have FM or some frequency-like number (i.e. 106) appended to their names, even if they never had a non-online version. For that matter, the "radio" moniker itself, since they aren't directly broadcast via radio waves.
The "oversight" user right, restricted to a small group of trusted administrators, allows those with it to allow access to a past edit by only administrators or, in some cases, only other oversighters; and also even remove an edit from the history in extreme cases. These steps are usually taken only within strictly defined situations for defamation or privacy reasons. When the feature was being added to MediaWiki, the original idea was that all administrators would be allowed to take these stepsnote A step eventually taken when the RevDel extension was made live for all admins a few years ago, although it does not allow administrators to hide individual revisions from the history, and the special group would have extra rights in order to provide "oversight" of this feature. The extension was developed under this name, and it was kept even as it was revised to allow only overisghters this power.
By the nomenclature and practice used within Wikipedia's namespaces, "Template talk:Did you know" would be expected to be the page where people would discuss technical and design issues with the "Did you know ...?" template used on the site's Main Page to highlight new articles. Instead, it is devoted to evaluating and approving the many nominations for "hooks" in it and the articles linked (because in the early days, people started using that page for the purpose since there were a lot less nominations).
Favicons are called that because they originally were only used for when you added a page to Favorites; its bookmark would appear with its favicon next to its title. Nowadays their main purpose is being displayed next to the page titles in tabs, and some time ago they were also shown within or next to the address bar.
Winamp. Despite its name, it's no longer a Windows-exclusive media player.