Like Command Line?

If you're a fan of command line tools, then the compression utility RAR might be for you. For me, I prefer a GUI interface for this sort of task. And where the major advantage of file compression for me is to exchange that file with someone else, I prefer to stick with a more widely used format, ZIP.  Of course, programs such as WinZip and the Mac's decompression tools can extract RAR files, it still doesn't help with the user questions such as, "What is this RAR file?"

From MacUpdate: RAR is a compression program offering an original algorithm. This new way to compress files provides greater efficiency, and makes smaller archives -- especially on multimedia files, and archives with many files. RAR also offers self-extracting capabilities as well as disk-spanning (or multi-volumes). RAR is the official RAR archive utility for Mac OS X (offered as a command line utility), especially useful while reading all those alt.binaries newsgroups.

Check it out at MacUpdate.