RYAN ERWIN  Ever need to move that background window so that you can write some notes related to what you're looking at? Ever want to position your windows right next to each other? Do you need to read something in your email in the window behind your web browser? Does finding the bottom right corner of the window just to resize it drive you a bit crazy? MondoMouse can take care of all this for you.

Personally, I use Mondo with the fn key to active window moving and fn + CTRL to active window resizing. Works great on my Mac Book Pro and my old PowerBook too!

I've been using MondoMouse for about 2 months now. I'm EXTREMELY satisfied with the product. I registered the product within 48 hours of downloading the shareware version and I couldn't be happier.

MondoMouse works by using Mac OS X's STANDARD accessability API, so it's not some unsanity type hack. It's a legit part of the system. If you've got the developer tools installed, you can launch:

/Developer/Applications/Utilities/Accessibility Tools/Accessibility Inspector

For example, I'm also a fan of the Textmate editor, but it doesn't support Apple's accessibility at the moment, so I've registered skEdit instead.

The application's author has been extremely responsive to bug reports and even released a fix to a "CAPS LOCK" related bug within a few days of the bug report.

If you ever used the old Unix Window Maker Window Manager and are familiar with the luxury of moving and sizing windows without bothering to click the right place on the window to do so, you'll love MondoMouse.

I've already tested it on my developer copy of Panther and it works great. Can't recommend it highly enough. This is something Apple should definitely include in the Core OS. Works great with Path Finder too!  
(Version 1.2)