To learn about collecting live recordings; Lossless files; Bit-torrent; FTP; Setlist; etc.
etree - start here, info, software, create your own collection page http://etree.org/ or sister site http://wiki.etree.org/
Deadlists - Need Grateful Dead show information http://www.deadlists.com/default.asp
The Jerry Site - Jerry Garcia database - http://www.thejerrysite.com/
The Philzone dot com - Phil Lesh Official website, great database http://www.philzone.com/
The Philzone dot org - Best mail orientated trade site, lots of lossless vines http://www.philzone.org/
New Lee Highway - David Bromberg database http://www.davidbromberg.net/
Tunabase - Hot Tuna & Jorma Kaukonen database http://tunabase.com/main.html
etree database - Largest live music database I know of http://db.etree.org/
Setlists dot com - You got it lots of setlists from lots of bands http://setlist.com/
Phishhook - Create your own on line collection page, good live music database http://www.phishhook.org/
The String Cheese Incident Setlist Archive - http://www.scs.unr.edu/~lcy/scisets.html
Yahoo Groups are a great place to find traders who like what you do http://groups.yahoo.com/
All Music Guide - If you need to find out if something has been released, or purchase released material http://www.allmusic.com/
Collectamitus - Therapy for tapers http://www.themusicarchive.com/vaults/addict.htm
Useful Download Links
The following are bit-torrent tracker sites (You will not find any mp3 crap here)
Dime-a-dozen - Wide variety of artists available. Monitored to the max to keep the lawyers off their backs.
Quality isn't monitored closely here (other than lossy recordings (mp3 ogg etc))
More or less a straight up trading site.
bt.etree.org - The original, very Jam band orientated, quality is a must
The Traders Den - Wide variety of artists, well monitored, and quality and lineage is more
Lossless Legs - Heavy on Grateful Dead & Dead related. Many other artist on tracker also.
Quality is mandatory here.
Zappateers - Strictly Zappa
Rusties Bit Torrent Tracker - Strictly Neil Young http://www.rustradio.org/tracker/
Boot City - Everything is here http://bootcity.org/
Internet Archive - Best information site on the web (home http://www.archive.org/index.php )
Live music archive http://www.archive.org/details/etree
Steam Powered Preservation Society - Some great classic bluegrass here http://www.thespps.org/