If you are interested in hearing some of the performances from Vegoose, go and check out the Internet Archive for a pretty nice selection. Most of them come in MP3 as well as Flac. The acts available are: Animal Liberation Orchestra, Spoon, The Codetalkers, The Decemberists, Michael Franti and Spearhead, Hacha, Sound Tribe Sector 9, moe., Phil Lesh and Friends, and String Cheese Incident.

Also, thanks to Largehearted Boy, here are some downloads for few other large 2005 festivals:
2005 Austin City Limits Music Festival downloads
2005 Live 8 downloads
2005 Bonnaroo downloads
2005 SXSW downloads

*** If you are looking for a tool to convert FLAC files check out Flac Frontend. It will convert them to wave and then you should be able to do whatever you like with them***
Enjoy.