My favorite song is "Weird Fishes/Arpeggi." You can hear it on my MySpace page.
If you like the song, you can get the album at inrainbows.com. This is old news, but for those of you who don't know, Radiohead released the album in October only on the above website and allowed consumers to pay whatever they want for it. Upon checking out, you specify what you want to pay for it, like $5 or $10—or even nothing, for that matter. Here's an article about how it all turned out for them.