If you are rooted, head over to xda and flash one of the CM7 that people are compiling from git. There are two seperate threads running over there about it, but just look for "thatguy" <----screen name, and follow his link to his shared links and try it out.
I have been running GB for 4 days now, and though its nice to have it on there I am not seeing any benefit from it. I use Launcher Pro Paid so the homescreen for me has no change. I do like the small tweaks in the settings section, especially battery usage.