Did you watch the Naples episode of No Reservations last night? If not, here's a link to the relevant video segment of Anthony Bourdain explaining and eating Neapolitan pizza. And some key quotes, courtesy of Eater's "Just the One-Liners" feature:
"Here's the most significant difference between New York style and Italian-style pizza: You eat it with a knife and fork. At no point is it acceptable, what I've seen with this technique, nationwide, you don't see people picking up the slice. They don't pick it up. Kooky, right?"
"I think everybody's pizza box or plate ends up looking pretty similar, all the sauce and cheese eaten out of the center, and who gets left behind, the crust. Like Jeremy Piven at a strip club."