Notch another victory for the Android community: shortly after Motorola publicly stated they would be moving towards unlockable bootloaders - even retroactively where possible - it appears that the Gingerbread update for the Atrix does just that. Brief Mobile laid hands on a leaked early build of the Android 2.3.3 update, and to their delight, found that unlocking the bootloader was as simple as using a simple console command.
I hereby declare this the poster child for "Mr. Blurrycam" photos.
It's worth pointing out that, according to Brief Mobile, this is an early build of the update. As such, there's a possibility that Motorola simply left the bootloader unlocked for developer use, and the final update will maintain the locked bootloader.