I was testing a web page using Microsoft Visual Studio 2008 Test Suite, when I saw the final report, it shows me that this page have big size (aprox. 800 Kb); wow it's a big web page, but it's a page that don't contains large images or other graphical elements, but have a lot of JavaScript code included.
Searching for a tool to minimize those javascript files, I found this site Bananascript.com, that's a free online tool to compress javascript files into very small and self extracting files.
I uploaded the biggest JavaScript file that was 600 Kb aprox, and clicked the compress button, the result .... a new compressed file of 300 Kb aprox, working without problems in my web project.
Then if you need to minimize a JavaScript file you can use this free tool, thanks to "wildcard_swe" for this work!.
Enjoy It!