Check out New Monsoon, Tea Leaf Green, and The Jim Weider Band. These are jam bands, similar to Umphrey's. Also, all of these bands have a TON of shows avaialble for FREE at The Live Music Archive. Pay special attention to the Soundboard (SBD) shows and the 24 bit shows - they sound as good as most commercial releases.
Here's some links:
http://www.archive.org/details/etree
http://www.archive.org/details/nm2005-04-01.sbd.flac16
http://www.archive.org/details/um2004-03-12.shnf
http://www.archive.org/details/jwpp2007-11-17.akg414.sbd.2496
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Here's some links:
http://www.archive.org/details/etree
http://www.archive.org/details/nm2005-04-01.sbd.flac16
http://www.archive.org/details/um2004-03-12.shnf
http://www.archive.org/details/jwpp2007-11-17.akg414.sbd.2496
-RW-