[cwharland]

For a GUI configurable and generally well behaved manager look at Divvy: http://mizage.com/divvy/

It's very customizable and has worked for me across at least three versions of os x.

[tonybaroneee]

Yep, I use Divvy on a daily basis and really enjoy it. Only thing I wish it had was a memory of the window size before it is re-sized with Divvy. Here's what I mean: In Windows, you can WinKey+RightArrow something to dock it to the right half (totally possible in Divvy), but then WinKey+LeftArrow returns it to its original windowed size. I use that technique a ton on my Windows box, would love to see an OSX window manager with that feature.

Edit: Hmm, looks like SizeUp has this feature with "snapback". Cool.