Drag your taskbar buttons into a more convenient order:

http://www.download.com/Taskbar-Shuffle/3000-2343_4-10531265.html

Resize several windows side by side in a snap, with magnetic edges:

http://www.allsnap.org/.

Tile and move several windows around with one mouseclick or hotkey.

http://www.winsplit-revolution.com/

Move and resize windows, add transparency effects and more, using hotkeys:

http://www.enovatic.org/products/niftywindows/introduction/