XENOPHAGE  Excellent. Unlike literally every other GUI rar compression tool I've tried, this one actually does its job and shuts up about it. I mean, what is wrong with all the others? Is it so hard to write an app that can recursively traverse a folder structure and add a whole hierarchy of files to an archive? This guy managed it, and did it without requiring me to click a million buttons and set up a bunch of options and drag a bunch of files everywhere, only to be faced with a terminal window, or worse - a silent failure. Sheesh, it's like we Mac users are being invaded by Windows users or something. Anyway, kudos to the author for not being lazy, and putting the user first.  
(Version 0.7)