Video tag file formats?

I'm working on setting up a video tag for a client's site with a Flash fallback. I'm wondering which formats of his video I need to include to be sure to reach as many browsers that support the video tag as possible. Right now, I'm including web em, ogg, and mp4 as well as a flowplayer flash fallback. Are there any other formats I need to include to make this work in all of the browsers that support the video tag?

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