The FAQ is down right now so I don't know for sure if it's there or not, but I'd like to see a better explanation about KK/sec ratings and what is considered a good score.
Also a tip, on the page for setting up RC5 w/ OS X it says you may need to go into Process viewer to kill the process after closing the terminal...I find that hitting Control+C in the terminal (before closing it) kills the process just as well.