I know it hasn't been released for X yet. But, once it is be wary of installing the update. So far, I've read several places that users of the Incredible and original Moto Droid have NOT had good experiences with the update. It's being reported by users that the phone takes 8 hours to charge, completely destroys battery life, runs multiple apps all the time (apps killers fail to kill them, they just restart on their own) even if you didn't open the apps, e-mail importing is an issue, and so is integration of social networking sites.
Word of advise: Once you receive the notice to upgrade your Droid X to 2.2 hold off and see if a lot of people are complaining about the update. If it causes as many problems for the X as it has the Incredible and original Droid, it may be worth it to wait for the first 2.2 update to be released to try and fix these initial complaints.
Just wanted to give everyone a heads up.