I've been using a MacBook Air for a couple weeks now, and I'm quite delighted with it. It's like the perfect balance between portability and usability. It's so thin and light that it practically disappears in a briefcase -- particularly if you're accustomed to toting a regular laptop around. With 5 hours of battery life, it's pretty easy to take into a meeting with you, and I hardly ever use paper anymore. The 13.3" (diagonal) screen has a resolution of 1280 x 800 pixels, which is quite usable, and the keyboard is full-sized with good tactile response and back-lit keys that are sensitive to the ambient light levels. The touch pad is excellent, so I don't even use a mouse with it. I went ahead and got the external DVD drive and Ethernet adapter. They're nice to have when you need them, even though they stay in a drawer most of the time.
This MacBook Air comes with a dual-core 1.6 GHz CPU (having two CPUs is wonderful), 2 GB of RAM, and an 80 GB hard drive. I got spoiled on a 17" MacBook Pro over the last 9 months, so the Air seems a little under-powered by comparison, but it's fine for what I do most of the time, which is run a web browser and basic productivity applications. I can still run Windows XP and Ubuntu Linux under VMware Fusion when I occasionally need to run something under those operating systems. I gave both Parallels and VMware a pretty thorough test drive, and I concluded that Parallels has a higher degree of integration between Windows and OS X (in the user experience), but VMware is far more stable -- especially with recent versions of Linux. I prefer stability; particularly since I usually launch the other operating system in a separate "space" and switch between spaces as if it were an old KVM (keyboard, video, mouse) switch connected to a couple different computers. The integration between Windows and OS X isn't very important to me.
Apple certainly knows how to design a usable product! The fit and finish of a Mac (hardware and software both) is like driving a Mercedes or a Lexus. It just feels like quality, with attention given to all the little details.
