Upgrade version Of Custom Recovery I have CWM already installed on my Android device.  To upgrade my CWM version, do I simply boot into fastboot and cd the new .iso over to my device?  Is it realy that simple?

EDIT -- The new file that I have is an .iso not a .zip so when I boot into CWM it doesn't see the .iso.

2nd Edit ---
I used this command when booted into fastboot to flash my recovery

fastboot flash recovery recovery-clockwork-5.0.2.0-olympus.img
It's even easier than that. Just flash the new recovery from CWM as you would any other flashable zip.