As rich web applications are being built with larger JavaScript code bases, the need for JavaScript compression to keep bandwidth and page load times as small as possible is becoming more important for faster load times and more enjoyable user experiences.

I was tipped off to to this handy tool by Alexei White who I work with at Nitobi and more recently on RobotReplay, which is actually the project he using CompressorRater on. Here's an example of the output:

All you have to do is copy and paste your code into a text box on the site and it returns this handy graph. Voila!