Mike:
Basically 15-20% is considered "normal" for the wait staff. Most places I know of "pool" the tips, and split at the end of the shift or night. The busboys usually get a cut also. That said, some places have a ''gratituity" (sp) charge added to the bill for parties of xx. You have to look at the bill so you don't wind up looking like a "rich guy".
My personal take is I tip based on the attitude and service the server provides to me and my wife, or group. I have left minimum (10-15%), and most times >20% for exceptional services. The local places that are sucking wind with the restrictions here usually get an extra as I feel for them. This is my personal choice, as times are tough for some.
