If you are in the business of dealing with file creation and your tight on cash (or your boss/corporation is too cheap to buy file manager software) Folder Brander is an easy way to quickly keep track of multiple files.

To me, the program is simple, yet easy to work with. The one thing that I'm not particularly happy about OSX is the cheesy folder icons--(not that it makes an impact on the fact that I love mac's overall style)
I hope Leopard has some more versatility in the manipulation of icons.

The skinny: I use folder brander whenever I have files that I want to recongnize quickly and I'm very happy with the purchase of the software O