Bitninja - again, thanks for the awesome app. I travel all the time, and this is completely saving my day since I know immediately when something kicks the power guzzling GPU into gear and can kill it without a second thought.
There is a weird little quirk though: whenever I am watching a video in QuickTime and go into fullscreen, I get the Growl notification that the GPU has changed, but the GPU hasn't. Same when I leave fullscreen. Same when I come back from screensaver. The message in Growl is that the GPU has changed to the Intel - but it was already on Intel

In short, the text is right, the event just didn't happen. Not a big deal at all, just makes my heart skip a beat when I think this evil GPU is going to kill my battery and then I realize it's still on the friendly Intel.