I don't ever really use Metro apps, but I do love the Windows Snap feature. It's in Windows 7, too - just drag a window to either side until you get the little glow dot, and then it will cover exactly that half of the screen. Or just use the Windows key plus left or right. That is probably one of my all time favorite features of Windows, and something that I miss every time I sit down at a Linux or Mac workstation. (I know it's possible to replicate it, but it's just nice having it built in.)
Not quite the same, but pretty similar.