Mac is currently working on reducing the weight of theMacbook Air. The move would reportedly raise production costs but shave upwards of a 100 grams off the notebook, dropping its weight from a hair over 3 pounds (or 1363 grams) to 2.78 pounds (or 1263 grams). The Notebook will shed a few pounds by replacing the Air's lower aluminum case, or bottom cover, with one constructed from carbon fiber. Surprizingly most of the weight is from the aluminum bottom, but the carbon fiber replacement will look exactly the same. If this move will raise costs, i still dont get who will want to buy it, A 3lb notebook isn't on my must have list, but im not a lazy american... so IDK. I guess.