truth be told, any hulu video used to crash firefox after 20 minutes, regardless of what else was running, and without a second screen. i have still not upgraded to 10.5.4, but do believe the switch to 10.5.3 may have ironed out some of these issues. like i said, expanded desktop with excel running and now i merely get some video skipping/chatter.
i am not sure if i really want to go the whole coolbook route, though might be up for cracking the case in search of excess thermal paste. this is my first mac, and while i do like many things about the platform, i think the fruit company needs to step in asap and get this figured out.