Most of the apps that are mentioned in this thread are junk. Don't listen to these people and contaminate your new MBP with these vile apps. Most of them are redundant
Just get BetterTouchTool. Its hands down the best app for OS X.
Some apps in this thread are useful so I don't agree with you that everything is junk, but wow! BTT is really really great! Easy and very very handy!