Ogg Theora

According to my latest tutorial https://www.youtube.com/watch?v=rZC8i7nq32k he mention to use Ogg Theora in stead of H264+AVI.
I don’t see anytinga abouth Ogg Theora on Vimeo Help pages.
Can anyone tell me what to use, as fit with Vimeo.

http://vimeo.com/help/faq shows you the best formats for uploading to vimeo. I generally stick with MP4.

I never heard of Ogg Theora before. I stick to MPEG4 and AVI.
Thanks place57