MacBook Pro graphics switching

Since I upgrade to 10.8 this morning, my MacBook has been switching to the AMD graphics and draining my battery. I'm trying to weed out the culprit, but I haven't had any luck...

So, awhile ago I saw a post on The Verge about an app to manually switch the graphics on a MacBook, but I can't seem to find the post anywhere. Does anyone remember the app or post? Thanks.