Cocoatech's Path Finder is the Mac OS Finder replacement that many users love (including us). If you haven't used it, you are missing out on something. A tabbed interface, insane customization options, powerful search (you can completely override Spotlight if you like) and so much more will have you ditching the Finder in no time. Path Finder can be run in conjunction with the Mac OS X Finder or on its own.
Today, it gets even better with the release of version 5.0. There are cool new features like a dual-pane file browser, which lets you display two folders simultaneously in one window and move files between them. Other new features include sidebar, Favorite Places and shared network places.
Many so-called "power users" complain about the Finder's limitations. If that's you, chances are Path Finder has the fix. It requires Mac OS
10.4 Leopard 10.5, and costs $34.95$39.95 for a single license. (Cocoatech let us know that they're working on the server issues that blocked access to the PF5 pages earlier.)