If you're looking to streamline your coding process, consider utilizing two essential tools: one for CSS and another for Javascript. By creating a simple shell script that links these tools together, you can easily execute them as a unified command.
For CSS minification, Compass is an excellent choice that offers various features.
When it comes to Javascript, there are several options available:
http://developer.yahoo.com/yui/compressor/
I personally prefer using a straightforward shell script that combines these tools and effortlessly uploads them to the web with a single command. This solution is tailored for Unix/Linux/Mac systems; if you require a GUI or a Windows-oriented approach, my expertise may not be as helpful.
Cheers!
EDIT:
After further examination, YUI compressor emerges as a promising all-in-one solution. Refer to Anmol Saraf's answer for more insights.