I've wondered how things would work with two monitors - does the mouse move from one to the other, like it would from one window to another on a wide screen? I think I'd rule out the two-monitor solution because it would be a less-than-satisfactory way to watch movies...
Same (but opposite) with a projector - great for movies, but it's hard to operate a mouse and keyboard while you're looking at the ceiling.
My priority is movies and I love the looks of a movie on Dell's 42-inch screen - but they say the lifetime is 5-7 years, that it has trouble with burn-in, and that the screen brightness diminishes over time. If I could be guaranteed 5 to 7 years (preferably 10) of perfect service, I'd make the leap.
My current monitor is a 19-inch CRT, and it does a great job for computing and so-so for movies (it's a bit dim). It doesn't make sense to go to a 20-inch LCD, which is about the biggest monitor I've seen with a workable price. Dell's 30-inch LCD TV with 1280x768 native resolution sounds like it would be good, and sounds like it answers the objections voiced above - but would it?

-Joe-