What's the plan for the laptop -- just to stay connected, or to download/edit photos? The 13 inch Macbook Pro can have 3x the hard drive space (750GB vs 256GB of flash memory), a much faster processor (2.7gHz vs 2.13), and twice as much RAM, and even all tricked out is still less money than the Macbook Air. The RAM is the biggest help for photo editing, I think, followed by the big hard drive.
If you step up to the 15-inch MBP, you get the quad core processor, which should speed up photo editing even more (depends on a lot of things, will wait for some tests to see.)
If you're just going to use it to download photos to an external hard drive, and maybe do a little peeking -- not actual editing -- then the MBA is probably fine. Nice sleek little machine.