Lossless / FLAC Direct Download Links(updated 9/29/15) :
Ousterhout.net: GD, Rolling Stones, YMSB, and many more. Both MP3 and FLAC available.
Guitars 101 Lossless Bootleg Forum: Gobs of flac files, plethora of different bands.
NYCTaper.com: Various bands. FLAC available for most, as well as MP3
Midnight Cafe Blog: Various bands including GD. FLAC and MP3.
Archive.org: MASSIVE collection of lossless files.
mega.co.nz cloud: GD & Ratdog. Some FLAC files as well.
Bittorrent Links(updated 11/13/10) :
bt.etree.org: everything you need to know about bittorrent, plus a nice bt tracker.