The idea for Pubdiff came about after frequently having the desire/need to show code to someone prior to checkin. There are awesome code review tools out there like Reviewboard, but they require installation and configuration - not something you always have. Pubdiff is for those situations where you need to do code review, but you're too lazy to set something up :)
Pubdiff is written in Python, and currently requires version 2.6 or greater. The client has no other dependencies. The code is hosted on Github, and the server code while super easy to setup, does have a few dependencies. If you happen to be interested in that lemme know and I'll write it up.