So, how fast are we talking here? I mean those Geekbench scores look ridiculous...
But Geekbench really isn't everything. 2.5 years ago I switched from a MBP to the new 7,1 iMac, and haven't regretted since. iPhone replaced my need for a portable, mostly, and the iMac offered a lot more power/size for less $.
2.5 years later, I love the unibody MBPs, nicest thing Apple has ever produced, but the internals have been disappointing IMO. Not that they haven't been good, but they haven't taken the leaps and bounds I've expected. I've yet to see a MacBook Pro that could actually challenge my almost 3 year old iMac in many of my common heavier duty tasks. However, the supposedly "good" ATI2600HD Pro graphics card is proving to be almost worthless in Snow Leopard. Expose, Top Sites, and iTunes suffer somewhat.
Now, if this i7 benchmark is real, and its part of an affordable 15" MBP, it would be the first one I've seen to make me consider switching back from desktop to notebook...
But unless Apple offers some compelling software updates on the Mac, I may just keep the old iMac for another 3 years and get an iPad instead.