Quick post about installing Rails 2.2 
I don´t know if it is related to Vista, or Windows or in general but, before installing you have to run: gem update –system and then gem install rails (–include-dependencies is still very friendly =)
If you had any issues with MySQL this guy found a solution (Portuguese): http://leonardofaria.net/2008/09/10/edge-rails-no-windows-vista/ It is pretty much about the fact that version 2.2 don´t come with MySQL adapter ?? Dunno 


Good News ! http://weblog.rubyonrails.org/2008/11/21/rails-2-2-i18n-http-validators-thread-safety-jruby-1-9-compatibility-docs
How to: http://almosteffortless.com/2008/07/21/simple-localization-in-rails-22/
Watch as well as Learn: http://railscasts.com/