I think I finally recovered from SXSW two weeks ago, laundry, liver and all. However, the guys over in Austin, Texas already in the works for their 2007 festival. Next year's SXSW is happening on these dates:
Music: Wednesday, March 14 - Sunday, March 18, 2007
Film: Friday, March 9 - Saturday, March 17, 2007
Interactive: Friday, March 9 - Tuesday, March 13, 2007
Registration is said to begin in August 2006. Word to the wise, you might want to look into booking that hotel now.