In the spirit of open source, you can download this site’s source from GitHub.
Updog is a Ruby on Rails application that interfaces with the Dropbox API. This application converts requests to updog.co to Dropbox, and sends back the result.
In order to reduce my chances of hitting the Dropbox API rate limits, requests to the API are cached for 30 seconds using memcached.
Here are links to the more interesting parts of the code: