So far one of my favorite quotes is
"yeah, every fanboy's dream, take Natalie Portman to your room and show her your robot."
EDIT: Well, I finally had to turn it off. I couldn't make it the whole way through the movie. It started off funny, but about halfway through the podrace they kind of gave up on it. It finally gets to they point were they just complain about the movie and don't even try to be funny. Every few seconds they let out a painful groan as if to say why the hell did we choose to riff this pile of tripe. I turned it off right as they are about to return to Naboo. I will finish it some other time, I at least have the lightsaber fight to look forward to.
You know, I think there was something to be said for the scripted riffs of MST3K, no matter how bad the movie got the jokes kept coming. The riff for TPM is a perfectly good example of what can go wrong without a script.