I feel like I'm being forced into buying the Air because of the screen resolution on the MBP. I have a custom built i7 920 desktop at home with an ATI 5870, 6gb ram, blu-ray reader, etc. I need a portable laptop for school/work. Battery life and screen resolution were highest on my list. With no option to even upgrade from the base 1280x800, I find myself looking at the air regardless of the weak processor.
I was in the Apple store today thinking exactly the same, somewhere between the MBA and MBP 13" is the perfect ultraportable.
Screen resolution on the MBP, 1440x900 from the MBA thank you etc. Backlit keybord from the MBP etc... i5 from the MBP, 128 or 256gb SSD from the MBA.