I did. For the individual differences, there is no comparison--especially for anyone running graphics-intensive apps.

Here are the differences:

*Video subsystem--The Macbook 2.0 uses an integrated graphics chipset (Intel GMA 950 with 64M shared memory), while the Dell and the Macbook Pro use add-on video cards with vastly greatly memory and horsepower. The Dell model uses an NVidia model with 512 M video memory, while the Pro uses a more-modest ATI Radeon with 128 MB. This is more than a $100 difference in price.
*Screen size--The Macbook 2.0 has a 13.3" screen, while the Dell has a higher-resolution 15.4" screen, similar to the Pro's 15.2. The supported native resolution of each translates into a difference of 1280x800 vs. 1440x900.

The component costs for the superior video card and lcd panel easily account for the price difference. When looking at the differences, you also see the hardware similarity between the Dell and the Pro.