A few people have written posts in which they ask you to vote for their sessions at MIX '10. Here you can read more about Shawn Wildermuth's sessions, John Stockton's sessions and about the two submitted sessions of Laurent Bugnion.
This year Microsoft decided to have an open call for sessions for the MIX 2010 in Las Vegas. This conference, in case you don’t know it yet, is a great 3 days about modern client technologies, such as ASP.NET, Windows Presentation Foundation and of course Silverlight. This year, MIX is taking place from the 15th to the 17th of March 2010 in the Mandalay Bay hotel in Vegas.