Maybe.
Certainly worth a try AND certainly Useful!
Apparently just like it's brother, HTML Tidy, CSS has caught up to par in the tidier department - CSS Tidy. But what does it do?
Well. One thing it does do is clean up your CSS.
In fact, if you have a fairly large CSS file, it could just well reduce your CSS actual file size by about 1/3!
Generally what it does is shortens color hex numbers and a bit of other shorter code. Is it the end all be all? Maybe not. Sometimes I personally like to see the full number and extra comments. Plus, it's certainly not going to write it for you! BUT.