Been there, done that, liked it, didn’t like ATIs Linux drivers though :(
The current ATI drivers aren’t THAT bad. I’m running the (proprietary) FGLRX driver and it works decent enough. Then again I don’t like Textmate at all. Either you run a REAL IDE (Netbeans/Eclipse variants) or you run a REAL texteditor (VI/EMACS). Textmate is neither 😉
</flame off>