The previous suggestions for removing the CMOS battery and removing the correct jumper are the only way to clear a CMOS password. Not the only way - as long as it's socketed and not soldered to the mobo, you can always yank the BIOS chip and replace it with a new one in a pinch. Most mobo manufacturers will happily sell you a replacement, and it's not even that expensive - $20 or so, typically.
Good point. Haven't ever had to swap one out. I imagine that my machine's life cycle has been short enough to avoid it (or I've just been lucky).