Official Website: http://www.sxsw.com
Check out the SXSW Party Planner in the App Store- it's FREE! Plan your outings at SXSW 2010. You can find fun events, save them to your favorites, get directions to your events, post to your social networks, and see where your friends and the crowds are!
You can also post your own event right from the application. Each person that posts an event will be entered into a drawing to win a free iPad to be given away at the end of SXSW!