My buddy has a Droid2 and it would take some work to make it fit properly. First is the location of the plug, and second issue is the plug is reversed (front to back) so it would need to be turned around also. And given the way the plug is mounted in the dock, it would require epoxying it in place, as the screw and bracket would not work.
Also, the side profile of the two fines is not the same, so the G2 will fit very loosely in the cradle. Again, some ingenuity and it could be made to work, but it wont be a quick fix.
Waiting patiently for CM7
T-Mo Samsung Galaxy Tab