Man, what is wrong with the posters on this forum? It's disgusting how fanatical some people are -- "OMG, how can you get rid of the logo of the company that is at the pinnacle of design?" "OMG, Mac OS X is so much better, why would you buy a Mac and not use it?"
As someone who bought a MBA, my first Mac ever, and use it to run Windows 7 -- here's my reasons:
1) For the price, the new MBA is deal. Find another 13" ultraportable that has a good GPU, decent display, a fast SSD, 7 hours of battery life for the same price or lower. I couldn't care less if it was made by Apple or Sony or Toshiba or Dell or Lenovo or HP -- all brands that I've owned at one time or another. Sure add in $100 for Windows 7.
2) Even if you find one that comes close in pricing, Macs have great resell value. People seem to trust second hand Macs more than another brand. I plan to sell this laptop within a year, and I expect to loose < 30% with this MBA, whereas most Windows laptops loose ~ 50% of their value in a year. One of the benefits of Apple's strict pricing discipline.
3) Mac OS X has proven to be inefficient for my usage. You can't even copy the path from an Finder window. No taskbar to see all my open windows. No easy way to tile windows side-by-side. If you get things done faster in Mac OS, then good for you. The Mac users I know, like most Windows users, don't bother or care about any of these features.