Weeks ago I made a CONFIRMED opentable.com reservation at Maria Pia for 6:00 PM. Just got bumped to 6:30 PM by maitre d'. The WHOLE POINT of opentable.com is to see the open inventory of a restaurant and make a no hassle, no call back reservation.
Chowhounders, beware of Maria Pia.
Just booked at Roberto Passion, a backup place recommended by this site. (Thanks, chowhounders.)