Had this since pr1.1 as well, And I have something like 4 desktop command execution widgets.. Could be it..
I also have the facebook widget, calander, conversations, media player, raemote, and some others that no one mentioned here...
Worse yet, when it freezes sometimes I won't get SMS- No notification, no sound, no led, no mentioning on the widget because it's stuck, and I'd only get them once I reset, which means I get them a day later...