Yeah, there have been many many iterations of these apps, by different developers. SizeUp + Cinch, Divvy, Spectacles. While I think that Apple should have just

Yeah, there have been many many iterations of these apps, by different developers. SizeUp + Cinch, Divvy, Spectacles. While I think that Apple should have just copied Microsoft's approach (i.e. what Cinch does) the wealth of options for window management means that everybody can find something that they like.