What are the output codecs and container formats? Is it just me or is this information conspicuously missing?
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.
"... a few others that we can't talk about yet."
With the On2/Google link this sounds like VP8.Oh, and then a harder one: Could you take a bunch of images & soundtrack file, and render it to a movie?
Not at the moment. It's something we're considering at some point, though.