Today I came across new cross browser CSS tool called Prefixr.com released by nettuts. Prefixr generates all cross browser CSS code (including IE, Opera :-o) once you give it the standard css code. Try it’s online tool, its awesome It also has an API exposed to users.
My favourite text editor TextMate (mac) can be easily configured to use Prefixr API. As Prefixr is still in Alpha stage, it still has some bugs but it will be great more powerful once it is fully our of alpha/beta stage.