I've been using the Better Touch Tool and Right Zoom to be able to maximize windows to full screen, and to resize windows to the center, or top right / left quarter of the screen. Those apps are pretty slick.
What I really want is a way to predefine some windows specs and then apply that to a window. For example, the window could be 1024 * 768, or maybe it could be 300px from each edge of the screen.
I know the green button is supposed to choose a nice size for the window but it doesn't always work and with some apps (like TextMate) I'd just prefer to have a preset size / position that I could use.
I could probably somehow use applescript, but at times it seems to take forever before it runs so a native app for this would be cooler.