DStein has posted some videos from archcon here:
https://bbs.archlinux.org/viewtopic.php?id=101587
In addition, I’ve started uploading videos here:
http://archlinux.ca/archcon2010/videos/
It’s going to take a while to get them all posted, so you’ll have to wait for them to trickle in over the next week or so. Hopefully some people will find them interesting, and will be motivated to give a talk at Archcon 2011 next year!