Hi ripb. Yep, our sales site needs a page that covers this. If you sign up and play around with the API, you'll see this info. At the moment, we do:
Input: just about everything
Output: H.264 video, AAC audio, and MP3 audio, in a MP4 or Flash 9+ container format. Ogg/vorbis/theora are coming soon, as are a few others that we can't talk about yet. We've decided to take the "narrow" approach for now - 99% of the demand that we see is for these five codecs (H.264, AAC, MP3, Theora, Vorbis). If there's anything in particular that you're looking for, let us know.