damn i can only think of about 1000. where abouts ate you located in the usa? try starting here http://www.jambase.com/Festivals/
Hmm...the only thing I can really think of would be Hippiefest 2008. I'm not sure if they come where you are, but here's the link anyway: http://www.hippiefest.net/ My friends and I went last summer. It was fun Nothing like Woodstock or Monterey Pop, but intresting nonetheless. Hope you find something. Music festivals are always fun.
For us people in the Midwest and can't afford the long trips to the coasts because of gas there are a few good ones. I will be trying to make it to Schwagstock 38 July 11-12 and I really want to make it to Rothbury Festival July 3-6. If anyone else is planning on going contact me so we can hangout.