The movie idea in nemu is awsome - but it works the same way, say, Need for Speed would record a demo. Tis a demo, not really a movie. My guess is it records keystrokes or imput instructions, times them, then replays the rom using them as the current imput. At any rate it rocks and will be used much by me
Use camtasia to record avi's, if you want to have real "movies". It just takes a lot of power.