Cargo Ship: Tom Morello x Arm the Homeless, apparently. More people might have noticed if the music wasn't so badass. (Tom's "Arm the Homeless" guitar is the one he uses for the band's F#-minor songs, like "Bulls on Parade", "Guerrilla Radio", "Know Your Enemy" and "Bombtrack", among others.)
Covered Up: Not as big of an example as others, but some people think "How I Could Just Kill a Man" and "Renegades of Funk" are RATM songs, when they belong to Cypress Hill and Afrika Bambaataa & the Soulsonic Force respectively.
Crowning Moment of Awesome: A grassroots movement sought to take their song "Killing in the Name" to the Christmas number one spot in Britain, and, by extension, prevent the winner of The X Factor from getting it, which had been the case for the past four consecutive years. It succeeded, outselling the #2 by 50,000 sales with downloads alone. Made more awesome by the band donating their earnings from the sales to charity and celebrating their victory by announcing a free gig in the UK in 2010.
Their show in Santiago, Chile in 2010, which Tom Morello described as the craziest crowd he's ever seen for anyone, anywhere. Have a look at it.
Tim climbing onto the set piece of the 1999 VM As after their video lost to Limp Bizkit's "Break Stuff" out of protest. Whether you think it was right or wrong, that's a pretty ballsy thing to do.
Face of the Band: Both Zack de la Rocha and Tom Morello. Many people probably won't have heard of Tim Commerford or Brad Wilk until looking at this page.
One-Scene Wonder: Zack was featured on a track by hardcore hip hop duo Run The Jewels, of all things. His verse was well-written and skillful enough to spawn debates about whether he wrote it himself or used a ghostwriter.
Tear Jerker: "Born of a Broken Man", "Darkness of Greed", "Settle for Nothing", "Maria" and their cover of "Beautiful World" by Devo.
What Could Have Been: They're a hardcore left-wing rock band who broke up right after the election of George W. Bush. They reformed, just in time for Bush to leave office. Fortunately, Sarah Palin was on the campaign trail.
They started writing an untitled collaboration with Tool for the soundtrack to the film Judgment Night, then both bands decided they weren't happy with it and left it unreleased. A very rough demo would surface as a bootleg - much of the verse lyrics are mixed too quietly to be intelligible and may have been placeholders anyway. RATM apparently did like the riff they used for the song's instrumental outro though; they reused it as the chorus for "New Millennium Homes".