Beosbox, feel free to use this info for update your sticky about RAR file: Stuffit DeLuxe is $$, but StuffIt Expander (drag&drop app) is absolutely free, and it can expand almost every kind of archives with ease.
Version 10 (old) gave me some problems with rar archives, not working with some of them, but the actual version (11) is fine.
The difference with the pay version (deluxe) is that with Expander you can only - you can guess - expand files, not archive them. But for the purpouse of mac simmers I think it's ok.

p.s. sorry for my bad english, I'm italian and not too much used to write in english.

p.p.s. glad to see you're another mac-simmer-user, if I understood it right ^_^