CSSPrefixer
Well, there is eCSStender, a solution for keeping your CSS code clean. And it sucks.It sucks because it doesn't work without Javascript and because it's a big, slow client-side script. And, of course, an extra HTTP request (unless you combine it with your code - and browsers will re-download it when you'll update your code).
I like the idea of keeping stylesheets clean, so I made a server-side thingy. Meet CSSPrefixer!
This awesome Python app rewrites your stylesheets, adding vendor-prefixed versions of CSS3 rules. It's based on cssutils, so it works only with valid CSS. But cssutils works fine with popular hacks, so it's OK.
