I second Moom and there is also Cinch (http://www.irradiatedsoftware.com/cinch/ http://www.irradiatedsoftware.com/cinch/) which I have used before. They do roug

I second Moom and there is also Cinch (http://www.irradiatedsoftware.com/cinch/ http://www.irradiatedsoftware.com/cinch/) which I have used before. They do roughly the same thing, but I prefer Moom since it involves less hand movement, but it's a matter of preference. Moom people also have Witch for window switching management on Mac. Personally it's not what i was looking for, but worth mentioning.