This is an exciting time in Ruby implementation land. Rubinius has gone 1.0, JRuby 1.5.0 is just released, and IronRuby has recently gone 1.0 as well.
In this presentation Will will show us why IronRuby is an implementation to watch. If you are developing Ruby/Rails on Windows then this is definitely the presentation to attend as I'm sure Will will show us how to get things running well. If your not a Windows/MSFT user you should attend as you never know when you'll have to integrate with some .NET service or deploy to a customer who's an all MSFT shop. Don't let that "Start" menu scare you away...
Hope to see you all there!