Rails 3 + Mongoid + HAML + RSpec 2 template
Quick app template based on the one from Les Hill :
rails new my_app -OJT -m http://gist.github.com/raw/473676/ca54399b18bd1f35587ef0a3891aa6b427508da7/app.rb
It gives you Mongoid + HAML + RSpec 2 + jQuery. This is my standard stack when I'm creating a new application nowadays.