Compared to the upper end White MacBook, Dell is $140 less expensive. I surprised (somewhat) that Apple isn't more price competitive. The Dell also has a 14" screen versus Apple's 13.3".
The Dell also doesn't have n wireless and doesn't state what resolution the screen is it. Also, being 14" probably makes it LESS desirable as it is bigger to lug around. Furthermore, Dell doesn't state the weight. I briefly considered PC laptops, but it's hard to find one that isn't a cow....
You also forgot to include the bluetooth, and if you include the 802.11n and the bluetooth, you are looking at less than $100 difference. Not to mention that if you want the "ultimate" version of windows, the Dell is MORE expensive. You get the ultimate version of Leopard with the macbook
That being said, how long does it usually take for the laptops to get out to resellers? Because of my situation(long story) I pretty much have to order from a reseller.