Winsplit (Window Management Utility)

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

It is freeware, but we may be able to work with the dev, if they would like to get more exposure. The portableapps list is long enough now that I'm definitely going to be referencing it if I need to find a good tool to use. That's how I found winmd5sum which I use in its normal installed state on my machines.