Could there be a more difficult program to compete with than the Finder? After all, it's not just ubiquitous, but for most people, it is the Macintosh interface. But the Finder has its shortcomings, and if you'd like to have a slew of tweaky options and capabilities that the Finder doesn't provide, Cocoatech's Path Finder is worth a look. It can show the full contents of many file types in its preview drawer, provide a drop stack to simplify moving items between folders while in column view, put a Trash on your Desktop, and a lot more. It also builds in numerous common utilities, including a PDF viewer, a terminal, an image editor and viewer, and a disk image creator, among others. For lots of folks, Path Finder is serious competition for the Finder.