Motorola earned a bit of a black eye from the modding community by introducing a hardware e-fuse used to enforce software restrictions, and they certainly aren’t helping their case by sending out cease-and-desist letters to sites offering "unofficial” Froyo updates for Droid X owners.
Website MyDroidWorld was the first of many Android sites to receive the takedown notice from Motorola, but it’s unclear at this point how enforceable the notice actually is. My guess is that most sites would rather comply than risk ending up across the table from Motorola in court. Realistically the “official” update is expected within the next 2-3 weeks, so if you weren’t able to track down the modified version yet you shouldn’t have to wait too much longer anyway.
Either way this likely won’t sit well with the modding community.