You can find the changes of Ruby 1.9 here. You mite face breaks between Ruby 1.9 and Rails 2.2.x. Ruby 1.9 works fine with Rails 2.3 RC0 and RC 1.
You can find more details about Rails 2.3.0 RC1 here.
This is a very interesting piece
Working with Rails profile is available at WWR
A good post on the changes in Ruby 1.9(Remember it’s not Ruby 2.0 and is still on an experimental phase).You can read the post here
FOSS.IN/2006 will be organized in IISc,Bangalore from 24th-26th Nov.2006.
See you at FOSS.IN/2006