I saw The Bourne Ultimatum, and man oh man was it great! Best of the trilogy, and left plenty of room for a sequel, even though it sort of came to a conclusion. Rarely does the third movie in a trilogy get better. Now I will grant one complaint people have had, the plot is sort of weak, but who cares? The plot is good enough to drive the action and any holes don't distract from it. If you haven't seen the first two, or don't remember them too well, I think it definitely benefits to rent them. I think TNT or USA has been showing the first one a lot lately.