Blogging coherently from a conference is incredibly difficult to do, but Matt Raible has done a great job with his notes on Dave Thomas' Intro to Ruby.
Phil Windley reports on David Heinemeier Hansson's (Google/O'Reilly best hacker of the year) Ruby on Rails presentation.
UPDATE: Matt Raible's report on the same Ruby on Rails presentation.
For more OSCON 2005 goodness, see the O'Reilly news page.