I am just about to install gfxCardStatus, I have a 15" late 2008 MBP running OS X 10.6.7. My question is: after all this time have you had any problems with it? Thanks!
The gfxcardstatus works great. But keep in mind that if you run your mbp in clamshell mode with an external monitor, it won't work. It's too bad that this configuration can't be supported.