Not much to say here, Rails 2.2 has escaped from the developers.

Rails 2.2 is finally done after we cleared the last issues from the release candidate program. This release contains an long list of fixes, improvements, and additions that’ll make everything Rails smoother and better, but we also have a number of star player features to parade this time.

Course, I'm still in chapter 1 of my Rails 1.1 book, so this is way too much for me to process on how good or bad it is :)