SecondShell is a portable utility that makes Windows Explorer a lot more user friendly

SecondShell is a tool that makes window management both less fiddly and more keyboard shortcut oriented. It doesn't actually do a whole lot (it's only 200 kilobytes!), but it adds such handy features that you'll wonder why Windows doesn't include them by default. First, you can resize windows by holding down Alt+Right click and dragging the mouse anywhere in the window. Alt+Left click moves the