Hm, some people have shoddy sarcarsm detectors. Next time i'll add huge /s tags.

I mean, why is this thread even here? Thinks about it. If the N900 Obviously can play youtube flash videos including full screen, what makes you think these 4OD youtube videos will be any different than all the other hundred thousand videos on youtube?

A simple "n900 youtube full screen" search nets you at least 3 thread talking about full screen flash. This could have been asked in those threads. Even better, the question did not even need to be asked as simple deduction skills will lead you to knowing that 4OD videos will play fine just as others.