Download the YUI (Yahoo User Interface) Compressor which compresses javascript and css files hence making the file size smaller and execution speed faster.

Download location: http://www.julienlecomte.net/yuicompressor/

It is very simple to use this application to compress the files. All you need to have is a java installation in your machine.

$ java -jar yuicompressor-4.1.2.jar cufon.js -o cufon-min.js

The above is the command that you need to execute from command line to generate the minimized version of the javascript file.

(In the example above, I have used the cufon script which is an alternative to sIFR way of handling different fonts across wide range of browsers)