you can also get entire shows back into the 70's on www.archive.org
Tunes
The archive is great, true that. But since the SBDs are no longer available to download I've had to find other sources

nugs.net has some great downloads for free (look under "free stash") of various dead shows etc and other jam bands as well.
http://stash.nugs.net/stash.asp
here are the dead shows available for free:
Just in case you need to add to your MP3 collection... I really like this link for Phish, Grateful Dead/JGB, and lots of other good jam bands.
http://www.mediafire.com/cobracommander
And the Brent Mydland website has some excellent links.
http://www.brentmydland.net/links.html