7 Free Tools to Minify your Scripts and CSS

And they've missed the Google Closure Optimizer for JavaScript: http://code.google.com/closure/

I'm not sure why YUI Compressor is last on that list, and why it's not mentioned that it also minifies CSS.

I wrote a couple of articles a while ago about minifying css/javascript on the fly. They utilise a mod_perl handler which intercepts outgoing css/js and compresses them on the way out.

https://secure.grepular.com/Compressing_CSS_on_the_Fly

https://secure.grepular.com/Compressing_JavaScript_on_the_Fl...

If anyone uses Kohana I maintain a packaged which wraps the PHP cssmin and jsmin libraries (plus some Kohana juice for serving files/caching)

http://hg.errant.me.uk/minify

There is also a port (or rewrite) for Kohana V3 that someone else maintains http://github.com/zazu/minify

For the Django dudes in here:

http://github.com/miracle2k/django-assets with which you can use your compressor of choice

http://elsdoerfer.name/docs/django-assets/

Two months ago I hooked up jsmin from a build script for release configurations. It's been helpful to have all of the reader-friendly stuff stripped out automatically without having to store minified copies in source control.

For .NET websites, Combres does minifying, compression, and combining of scripts: http://combres.codeplex.com/

For Dojo as mentioned on the post comment

http://dojotoolkit.org/docs/shrinksafe