what type of video formats does the PS3 support?

For example, MP4, MPG, MPEG, AVI, FMV, etc....

which ones work? I know MP4 files do, but is that the only one?

It supports divix too.

Here's you a link.... ;) Its a complete list from the PS3 website.

I'm pretty sure all the ones you listed are supported. However, some of those will not appear in your menu if you select your thumbdrive, so instead you have to highlight your thumbdrive and have it "display all" to see everything that's actually on it. If it appears there then it is playable. I've yet to come across anything I couldn't play. I mostly play .AVI files, though and PS3 is the only console that does that. Anyway, for a more extensive list just google it.Nephilim83