Efficient JS/CSS handling in .Net
Note: this post is over a year old, it's very likely completely outdated and should probably not be used as reference any more. You have been warned. :-)
This seems like a very useful project, I'll definately be looking at it for future projects. Quote:
"all of your style sheet and JavaScript files in your ASP.NET web application can be automatically minified, compressed, combined, and cached".
http://www.codeproject.com/KB/aspnet/CssAndJavaScriptOptimizer.aspx