Strengthening the Ruby Ecosystem Part I: Rubinius by Evan Phoenix - Evan gives a general overview of Rubinius, how the project has worked out so far, and what the goal is with its development.

Strengthening the Ruby Ecosystem Part II: Merb by Ezra Zygmuntowicz - A similarly general overview of Merb, a Ruby Web applications framework. A great executive overview of the Merb project generally.

Code Generation: The Safety Scissors of Metaprogramming by Giles Bowkett - Giles looks at the beauties (and dangers!) of meta programming and other voodoo with Ruby. This is a particularly interesting talk, and an ideal one to watch if you're short of time.

Faster, Better ORM with DataMapper by Yehuda Katz - An overview of the DataMapper ORM, a compelling alternative to ActiveRecord.

Deep Ruby by Jeremy McAnally - A look at Ruby's object model and other "deep" Ruby issues. This is a pretty interesting talk too, for those who like to look at the nitty gritty.

BDD with Shoulda by Tammer Saleh - Shoulda is a great, small, simple testing plugin for Rails applications with a BDD flavor.

Lightning Talks by Various - The lightning talks include Mike Moore doing a "Binary Lottery" program with _why's Shoes, Chris Shea talking about "Guessmethod", Ed Moss talking about Active Scaffold, and more.