If you are running a leaked version of 2.2 on your X DO NOT DOWNGRADE to SBF to get the official version or just do not downgrade. With the official version of 2.2 there is a new bootloader that is bricking people's phones. This is information that is coming from MDW.
MyDroidWorld - Droid X Owners: DO NOT SBF BACK TO 2.1 FOR ANY REASON AFTER OFFICIAL UPGRADE TO 2.2
Happy upgrading, personally since the "official" version has the same two issues I am having with the leak and you can't sbf anymore (for now). I am sticking with 2.2 leak for now see what happens when the water resends.