Ludomac has compared the performance of the 2GHz MacBook Pro to the 1.67GHz PowerBook G4.
The MacIntel is two times faster than it's PPC predecessor with universal binary games, and two times slower in PPC emulation. This was to be expected as the games do not utilize both processors.
To read the test and the details [in French, but you should be able to understand the graphs]:
Ludomac
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Apple
CD Drives
G5
Hard Drive
Internet
iPad
iPhone
iPod
Laptop
MacBidouille
Mac Intel
Mac OS X
Network
Overclock
PC
Peripheral
Software
Sound
SSD
Video
