Some people want a computer to show off with. Some people are manager types that do nothing more than read emails and powerpoints. For those people, an MBA is ideal.
People here get the impression that an MBA is for executive type who just cares about fashion, just cares about portability, or both. The reason for buying an MBA can be neither of these reasons. It could just be the design, which isn't so ridiculous. After all, we don't treat clothing, cars, houses, shoes, keyboards, mice, pens, pencils, cameras, chairs, etc, as utilitarian objects. We choose and purchase these things based on a plethora of reasons.
I also don't understand why people think the MBA is just an underpowered piece of pretty crap. What is "underpowered"? Everything that I personally do with my MacBook, I can do equally well with an MBA, and I'm in physics/prostate cancer research. I'm NOT the executive type who wears a suit and carries a $600 briefcase to meetings. The MBA is light, doesn't lack processing power, and does essentially everything that I do with my current 2.0 GHz Core 2 Duo MacBook. It's equivalent to carrying everything I
need in a laptop with me, rather than just carrying everything with me in case I need it. If I bought a bluetooth mouse, I'd still have the USB slot free. I don't need the 2nd slot because I only need 1 USB slot on my MacBook. I also never use the DVD drive, so an external would work fine for me. Cut the excess out, and I have an MBA that's lighter.
The only thing I would lose if I purchased an MBA is unnecessary weight, an extra 1 GB of RAM (I have 3 GB), an ethernet port, and around $500. However, it felt solidly-built and looks great. I can't say the same thing about my MacBook.
I'm not saying "I want a MacBook Air". In fact, my next laptop is likely to be a MBP, not an MBA. However, I'd definitely consider the MBA.
This proves my original point - MBA is a machine for people who want to look cool rather than people who want performance.
And I guess my point is that people with your mentality are complete hypocrites.
Again, not everything has to be about utilitarianism, and I'm sure the same people who criticize someone for spending an extra $500-600 on a laptop just for its appearance are the same ones who spend an extra bit of money to get the nicer pair of shoes, shirt, (computer) accessories, or car at some point in their life. You have. Fess up.