Dav Yaginuma's blog
The Confreaks site has released a slew of videos from the 2007 RubyConf. The videos are in the perfect format: side by side streams with the projection material on one side and the stream of the speaker on the other.
Many great sessions are covered, including a good one on the Treetop parser presented by Pivotal Labs' own Nathan Sobo. As a bonus, in the audience you can spot other Pivots you may be familiar from this weblog (Nick Kallen and Brian Takita).