I watched the whole thing and didn't see you try to force quit whatever application you had running there.
I saw you stroking the trackpad and punching the keys, kinda good cop bad cop sort of thing, closing and opening the lid too.
How much RAM is installed, did you add extra RAM to this machine, can you reproduce the problem, is it the same app that freezes, if so, what app is it?
Is this MacBook Pro under warranty?
If so, what does Apple say about your repeated calls to them?
I'm having a huge problem with my MacBook Pro and so far no Apple Service was able to help me! From time to time - sometimes it's week, sometimes just a few hours of work - my Mac freezes completely. There's absolutely nothing I can do once it happens, except from shuting it down. All the hardware tests goes fine. It's not the system cause I've already made few clean installations of both Leopard and Snow Leopard. It doesn't have anything to do with the application I'm working with at this moment. And I don't use any external hardware at all!
I've been fighting with this problem for over half of year now and nobody was able to give me any clue so far. For a better view of this problem you can check out the short video I've prepared showing how it's behaving when the problem occurs: http://www.ucntn.umk.pl/macfail/.
Can't wait for some help.