Here are these things in case I need to find them again:
- A link_to helper for Sinatra
http://ididitmyway.herokuapp.com/past/2010/4/25/sinatra_helpers/ - A flash[:something] gem for Sinatra
https://github.com/SFEley/sinatra-flash - OmniAuth for rails / ruby
http://railsapps.github.io/tutorial-rails-mongoid-omniauth.html - Twitter auth in Sinatra
http://www.sitepoint.com/twitter-authentication-in-sinatra/