Put on your party hats people!
The long awaited version 3 of the Rails framework is finally here
Seems like only yesterday (2007/2008) that Rails 2 was being released, and now this. Frickin’ monumental.

PS: Rails 3 works with Ruby 1.8.7 and Ruby 1.9.2 … it segfaults with 1.9.1, so remember that when upgrading your ruby installation