Bjango released iStat Menus 5. I really like this app, but found a minor issue today. I've already sent the folks an e-mail, but for the sake of the internet, I'm documenting it here as well.
iStat Menus can show a graph of your CPU usage along with a nice quick lookup table with the most busy process. It seems it tries to do something helpful with the process name, but in the case of ClamXav, a free and open source virus scanner, it says: ScheduleHelper. The process name in Activity Monitor is more to the point: clamscan.