I got my D2 Global SIM unlocked yesterday. Called VZW Global Support (1-800-711-8300) and they gave me the code (once you put in a non-VZW SIM, it will automatically ask you for the code.) As long as your line has been active for at least 6 months with no late payments, they will hook you up.
HOWEVER, it appears there may be more to the unlocking process. When I did a GSM network scan, no networks showed up. Others on various forums have been reporting the same issue in the last day or so. Normally when you put in a SIM into an unlocked GSM phone, you will see the roaming network options.
It's possible that they have blocked US GSM networks and foreign networks will work fine, but I'm hoping others can shed some light on the issue.