You can use DoubleTwister to sync iTunes to Droid x, the process:
* Download and install doubleTwist
* Connect your Droid using a USB cable
* Select "USB connected" and then "Mount" on your Droid x
* doubleTwist will launch automatically (if you use Windows)
* Set up your sync settings or just drag and drop media to your Droid x
* doubleTwist will automatically convert your videos so that they play on your Droid x
P.s. For DRMed iTunes songs or videos, DoubleTwist is willing to help but unable to do so about this, cause it cant remove drm from iTunes. For this case, you can get a step-by-step tutorial via my signature to get it done: