What models of Core i7 are available in the MacBook Pro
The specs are available at this page.

The 2.53 i5 is the I5-540M (2
   physical / 4 virtual cores, and Turbo
   Boost overclocking).
The 2.66 i7 is
   the I7-620M (2 physical / 4
   virtual, and Turbo Boost).The 2.80 i7
   is the I7-640M (2 physical / 4
   virtual, Turbo Boost).