Fox has now opened a Myspace site where you can watch episodes of some of their best shows for free! You download their player (took me less than a minute) and you can watch episodes from this year:
Bones
Justice
Prison Break
Stand Off
and several others
Multiple episodes, only a brief commercial with intro I think!
Run about 45 minutes each
You have to have or create a Myspace account (also free) but the quality is excellent!
http://www.myspace.com/fox