Have Apple lost the plot?
When I bought my first MacBook nearly 4 years ago it was a good buy. It was priced in with similarly speced PC laptops. Now it's not worth the money when I can get so much more for a lot less. I love OS X but not that much that I'd pay £850 for this thing when Windows 7 isn't actually that bad.
Let's say I was interested though. The first thing I'd want to do is upgrade the RAM to 4GB. I only usually use 1GB - 1.5GB with both OS X and Windows 7 but there are times when I need the extra memory. My old MacBook, now maxed out at 2GB, just won't cut it any more. An upgrade to 4GB for this MacBook is £80 - £85 (Apple and Crucial prices) so I'd rather pay the extra £150 for the 13" MacBook Pro and get FireWire, a SD card reader, aluminium case and backlit keyboard.
It won't surprise me when, in a few years time maybe, Apple decouple the iPad from iTunes and sell iPads as their casual/home user portable device and drop the MacBook altogether. They're having much more luck in that space than they are in the laptop space after all.