michele - there are melting chocolates in the baking aisle usually. they look like really wide flat chocolate chips. baker's also makes little tubs of microwaveable dipping chocolate (although i took it out and melted it in a double boiler)
btw, this weekend i'm making them again and i'm going to try a batch with the mint oreos. i'll let you know how that goes!
karen - what if you included some crushed graham crackers with the oreo and cream cheese mixture, made into flatter balls, dipped them in chocolate, then put a small dollop of marshmallow cream on top?