There is a great resource that you won't find on that page: appengine-jruby. It works with Sinatra or Rails, so you can write beautiful ruby code and upload it to Google where it will be compiled to byte-code and served. Check it out: <a href="http://code.google.com/p/appengine-jruby/" rel="nofollow">http://code.google.com/p/appengine-jruby/</a>