A16 (SF and Oakland) brings the pizza to the table uncut, accompanied by kitchen shears.
while not neapolitan (they model after delfina, which i have not tried), my friends at Rocco in Rochester NY serve their 10-12" pies this way also. they stuck to their guns after some initial bitching, but most everyone is used to it now. many customers really like it.
interestingly, there is a newer place called Branca in the burbs-- VPN, +serves them sliced.