Somewhat annoyed that their three comparison computers are all Macbook Airs. Ignoring the fact that you're comparing different OS and most people will choose based on that alone, there are several decent Windows-based ultra-portable computers out there. The Samsung Series 9 was the first 'Macbook Air killer' and is still solid. There's also the Asus Zenbooks (as mentioned already) and the Toshiba Porteges (Z set), among others.
I'm not entirely convinced that being a "Macbook Air killer" is even that important of a goal. It proves that you can do it & there's a bit of a halo effect but I've not seen enough people using MBAs to think that it's really a major market segment to chase.
