Our streaming team has been doing really great job and we already started uploading some videos from the conference.
We're still in the process of encoding and uploading, but videos for all talks in DeNA room (Day 1 and 2) and Larry Wall's keynote are now uploaded and they are embedded in the talk details page linked from the schedule, like you can see in Larry's keynote page.
The video quality varies between the room environment and camera quality but so far they look all good. If the slides are hard to read, be sure to check out the slides uploaded by the speaker (if any) to help the viewing experience.
We first upload the video to Nico Nico Douga (you might need a registration to see the video on their site but you don't need to as long as you see on our YAPC site), and plan to upload the video to Google Video so you can easily export the video to devices such as iPhone, iPod or PSP. (Google video re-encodes all files, so if you watch them on the browser the quality is not nice, while you can download them as H.264 MP4 and it's much better)