ALCIMEDES  Unlike some other users, I just tested the app and it was able to extract and archive I'd created with multiple files and folders just fine.

For those having trouble with this app., I'd highly recommend downloading the free GUI interface to go with it.  
(Version 2.5)

ALCIMEDES  I downloaded WireShark today and must say that after the initial run through I'm very impressed.

Obviously a Win/Unix port based on appearance, but it can do what I've had a hard time finding any other free Mac app. capable of doing.

It's keeps detailed logs of all network traffic and displays them in a handy GUI interface.

If anyone is interested in where their traffic is going you should give this app. a shot.

I only took off points because the appearance is obviously not Mac standard which some people won't like, and quitting the app. required a force quit.

Considering what it brings to the table they are minor complaints though.  
(Version 0.1)