Aqua Snap

[cmpm]

I found this useful and easy to work with.
Not as annoying as one window taking up half the screen.
Multiple monitor support.
And I don't install very many tweaks to the standard W7 features.
It does run in the background.

http://www.nirmaltv.com/2010/09/25/extend-windows-7-aero-features-with-aqua-snap/

[Curt]

The application works with Windows XP and Vista as well and does the same features.

AquaSnap is a simple freeware tool which brings in better features to the Windows 7 aero. AquaSnap makes the window management much more ergonomic: you can drag a window to the border of your desktop, and this window will be snapped and resized to fit one half of the screen. You can also drag this window to a corner, it will be snapped to fit one quarter.

[cmpm]

Thanks Curt.

[nudone]

this might be a better link, from the creators of the program (i think): http://www.nurgo-software.com/products/aquasnap