ExtensionFM is a Chrome extension that picks up links to mp3s as you browse the web and adds them to a media library.
The Ultimate Bootleg Experience is an ecclectic mp3 blog dedicated to live boots with a good number of posts up, and the links in the archives seem to stay live for quite a while.
The "Bootlegs" section over at The Rawking Refuses To Stop has a ton of great stuff, from a stripped down live acoustic Jeff Tweedy & Jay Bennet set (right before YHF was released) to a mock-up version of the unreleased new Radiohead album using the best available live tracks from the most recent tour to a rare Paul McCartney, John Lennon & Stevie Wonder jam session to all sorts of smaller gems.
Happy Vinyl Record Day, everyone. On this date in 1877, Edison invented the phonograph. To commemorate the date, a blogswarm of 22 of the best vinyl sharity blogs out there have come together to celebrate the legacy of the dominant recorded music format of the 20th century, led by jb of The Hits Just Keep On Comin' and featuring Flea Market Funk, Echoes in the Wind, Funky 16 Corners, Davewillieradio, Good Rockin' Tonight, Py Korry, It's Great Shakes, (bonus!), Ickmusic, Jefitoblog, FuFu (bonus!), Lost in the 80's, Three-Sixty-Five 45s, Underground Vault of Records, AM then FM, The "B" Side, In Dangerous Rythm (bonus 1, bonus 2), You Must Be From Away, Got The Fever, Retro Remixes, Bloggerythms and finally The Stepfather of Soul.
The 50 most underplayed and under-appreciated rap tracks according to ohword.com, all in one download. Some of my favorite hip-hop music blogs. For those who aren't hip-hop fans, an exhaustive list of MP3 blogs.
There are so many great old vinyl rarities being shared @ Scar Stuff, it's hard to pick a favorite. But for me, the front runners are Count Chocula & Frankenberry's Monsters Go Disco & this outrageous 1971 sex record, Wife Swapping Swingers Party. It's like obscure sampler's paradise.
The Hype Machine tracks MP3 blogs so you don't have to.
"The saxophones would eat the same thing as Gene [Vincent]." - Now how do I mark this as best answer?
There is a new question asking website. It is powered by humans via the Mechanical Turk program. Said the Gramophone has a bit of fun with it.