Its weird, but in the past I have used Motorola chargers to charge my Blackberry, but the Blackberry charger would not charge the Motorola..Don't know if it will be any different this time..I hop so I have several Blackberry chargers. It will suck if I have to buy more for my Droid....
Most motorola products are wierd and can only be charged by a motorola charger or USB straight off a computer. I don't know how they code the charging port on motorola phones but they know when its not being charged by a motoroal charger.
Most any other product will work mini or micro USB.