Most schools are rolling. Off the top of my head, I could probably only think of maybe a dozen that are non-rolling, which include some big names and the public TX schools.
Texas schools (http://www.utsystem.edu/tmdsas/) starting this year (entering class of 2007) is now rolling! However, you can hold to multiple acceptances in Texas until feb 1, 2007.
Sorry. I guess Texas decided to act like the rest of US Medical Schools.
Thank god I applied and accepted before this change in admission procedures.
But do consider Texas, the average stats is slightly lower than AMCAS schools.