Videos from the recent Ruby Hoedown conference are now available at the Confreaks site.
The talks this year are split between traditional talks and "Lightning Talks" - 5 minute presentations that quickly highlight a single package or aspect of Ruby. The talks cover a wide range of topics including Archaeopteryx - a Ruby MIDI/Music generator, easy phone calling with ruby, cloud computing, the usual excellent testing and design patterns talks, and a slew of other quirky and useful presentations.
If you don't want to sit through the talks at normal speed, you can download the presentations in .mp4 format and increase the playback speed in your video viewer of choice. I've found that the videos are perfectly watchable at 2x speed in Quicktime (Command-K > Playback speed.)