These are the Festivals I attended in 2011 – click for the review or official website:
March 2nd-4th. Snowball Music Festival. Vail, CO
April 15th-17th. Coachella Music Fest. Indio, CA
May 27th-30th. Lightning In A Bottle. Lake Irvine, CA
June 9th-11th. Bonnaroo. Manchester, TN.
June 24th – 26th. Electric Daisy Carnival, Las Vegas, NV
August 5th-7th. Lollapalooza. Chicago, IL.
August 12th-15th. Outside Lands. San Francisco, CA.
August 29th-September 5th. Burning Man. Black Rock City, NV.
September 16th-19th. Austin City Limits. Austin, TX.
October 28th-30th. MoogFest. Asheville, TN.