Forget that aluminum enclosure, screen, or trackpad. I wasn't and am still not impressed by either of them. The aluminum seemed to show spots badly, and the glass reflects. Actually, I don't even use the trackpad on my 1525, and hate that glossy screen too.
I would have compared the CPU, but Apple kindly left out the model number for the CPU they use. Anyway, if you know that info, you can compare mine to theirs and come up with a summary.
I did mention the memory being different, however the screen has the same resolution, and is powered by an X3100. Low video card, yeah, but hey, it's powering a 15" screen.
Weight is 5.2 lbs. It's running Ubuntu 8.04, so I have all the software I need, and more, from editing our home videos to managing our music and photos.
I do have Firewire, that the new MB owners seem to like/want.