The new Macbook Air is at its thickest point, .68 inches, weighs 2.9 pounds, and at its thinnest point is .10 of an inch. It uses the same Unibody constructions used in all Macbooks, a 13.3 inch screen with 1440×900 resolution, 802.11n Wi-Fi, full size multitouch trackpads and keyboard, a Facetime camera, 1.86GHz Core 2 Duo processor, Nvidia 320M Geforce graphics, and uses only 128GB or 256GB of flash storage for instant-on usage. The battery should last 7 hours in Web usage and 30 days on standby time.
Some of the same specs apply to the 11.6 screen model with a 1366×768 resolution screen and 64GB to 128GB SSD storage, 1.4 GHz Core 2 Duo model except being lighter than 2.9 pounds at 2.3 pounds and is thinner, although having 5 hours of battery life, less than the larger model. Pricing schemes are as follows: the 11.6-inch model has 64GB of flash memory for $999, and get a a faster processor for $1299. All models have the Nvidia graphics cards and 2GB of RAM. Both are available starting today.
On a personal note, I see that the new Macbook Air might make a fine addition to my laptop collection, but is it necessary? In one word: if you have $999 bucks to spare on a Mac: hell yes.