Holy cow... this "research" is so skewed it's NUTS!
First of all... I configured a Dell E1405 (which I believe is the same as a 640m) to the same specs as a MacBook and with the 30% coupon (common all the time, sometimes go up to 40%) it's $750 shipped.
$750 vs $1099. That's a $350 premium. Now... the E1405 has a few benefits over the MacBook. It's cooler, cheaper, and can use an extended battery. The MacBook, however, has an iSight camera -- though I rarely use mine -- and looks amazing.
I'd still pick the MacBook... but yeah.
You added a whole lot to that Dell that shouldn't be there -- including the extended life battery. The extended battery gives you 7+ hours of battery life on the E1405, that's a whole lot more than you get on a MacBook.
That said, I'm a huge mac fan. I paid $2000+ for my MBP because I love the design of Apple, not the price.
The MacBook does show a great value if you factor in design, but if aesthetics aren't important, Dell still beats Apple hands-down for price.