No problem. I happen to be hacking on a Sinatra app that runs on heroku right now, so here's a Gist:

https://gist.github.com/744173#file_a%20simple%20sinatra%20a...

Check it. I wrote this mostly from memory and a few quick copy/pastes, I'll update something if I did something dumb. But that should work.

You'll probably want to add their gem to the gemfile for this contest. Stick "gem 'indextank'" in your pipe and smoke it (aka 'bundle install' again).