1. In a food processor, pulse the graham crackers until they are crumbs. Set aside.
2. With an electric mixer, beat the cream cheese and 4 of the tablespoons of powdered sugar. Add drops of milk until the sweetened cheese can be piped. Fill a pastry bag with the cheese mixture and set aside.
3. Combine the 2 cups of whipping cream and 4 tablespoons of powdered sugar and whip with an electric beater until firm. Add the 2 tablespoons of Zinfandel and continue whipping until incorporated. Fill a pastry bag with the whipped cream and set aside.
4. Place one or two scoops of ice cream in each of your serving glasses.
5. Pipe concentric circles of the cream cheese mixture on top of the ice cream. Don't put too much cream cheese into the sundae, two or three concentric circles are enough.
6. Spoon a generous amount of Zinfandel sauce on each sundae.
7. Sprinkle some graham cracker crumbs on top of the sauce.
8. Pipe the whipped cream on top of each sundae.
9. Decorate by sprinkling graham cracker crumbs on top of the whipped cream and serve quickly.

If you don't have a food processor, you can place the graham crackers in a plastic bag and pound them with a heavy object until they are crumbs.

Try substituting mascarpone for the cream cheese if you'd like a tangier sundae.
Makes about 6 sundaes.