Core2Duo MBP is the "Bee's Knees"
After six days I can pronounce my 15" MBP (2.33 matte, 3gb, 160) a most outstanding machine!
I bought the first gen MBP back in May - but then ended up returning it a few days later for a refund because of the infamous whine; and secondarily because of the excessive heat it produced. I was unhappy enough with both of those issues to eat the $200 re-stocking fee they hit me with.
My reference machine is my 12" PowerBook, my first Mac and easily the very best computer I've ever owned. I expect this new MBP will probably assume that mantle.
Both the whine and heat issues of the first gen machines have been resolved. The new machine is incredibly quiet. Fan use is minimal and you can hardly hear the 160gb Hitachi drive. It also runs considerably cooler than the first gen machines. It actually runs cooler by 4-6 degrees than my PowerBook - 115 degrees (Farenheit) or so when idling or otherwise doing light work (web browsing, email, Word, etc.). I was able to get it to hit 160 or so when an Xcode installation was indexing its Java documentation (this after a dialog had warned it would take 20 minutes to an hour to perform); and 170 when Aperture was importing several gigabytes of high-resolution digital photos. But for the most part it stays in the one-teens.
I love the (to me, coming from a 12" machine) extra screen real estate, the light-touch keyboard which works great for touch-typing, and the two-finger track pad makes an enormous difference in ergonomic ease.
I do a lot of serious photography processing, work which I do on a desktop Dell. I'm planning on buying a Mac Pro next spring (when Adobe universal binaries are available) and have been planning on migrating my workflow to the Mac then. I'm still expecting to do that, but am sufficiently impressed with the horsepower of this MBP that I might go ahead and start trying some of that work (scanning with my Coolscan 9000, etc.) on my new MBP. I'm really liking this machine.
And who'd have ever thought that the coolest thing about Windows XP would be seeing it appear inside an OS X window?! Adobe wouldn't let me transfer my Dreamweaver license from my PC to my Mac (even though I officially deactivated it from my Dell). To hell with 'em. Thank you Parallels...