Motorola also offers a pretty liberal bootloader unlocking policy, which you’ll find at their developer site. Using the standard Android SDK tools, you can unlock your bootloader so that a custom recovery image can be flash. This allows you to flash any other system image to your phone.
If your Motorola phone isn’t covered under their bootloader unlocking policy (see the list here) — this means Verizon, of course — you might have to resort to exploits or commercial software like MOFOROOT or OneClickRoot. Once again, we have to remind you about using tools created by someone else that may have admin access on your phone or your computer, but the option is available.
We’re waiting to see if the coming generation from Motorola is as developer friendly as they have been in the past, and we’ll update accordingly.