DON'T BUY THE 30TH ANNIVERSARY CD SET!
I want to recommend it but I just can't - yes, it's remastered, but at one point a release a few years back had a better selection of the Wattstax sound.
I'd like to re-write my review for it here from my original review on Amazon, but I'll save you and I both the trouble... here it is, please read it for yourself:
http://www.amazon.com/WATTSTAX-3-CD-Deluxe-Various-Artists/dp/B000SNUNY2/ref=sr_1_2?ie=UTF8&s=music&qid=1290924061&sr=8-2
Thanks, and BEWARE!