That's right, John Lam has his team have put the latest release of IronRuby out on RubyForge (this took place on 8/31/07).
Fellow rubydoes.net blogger, Aaron Junod, has a great post on getting IronRuby from RubyForge with TortoiseSVN.
I'm personally looking forward to this evening's coding "festivities" as I try to integrate some code into the project. Good times!