The Pro's new glass trackpad has nearly a 40% larger tracking surface, and now acts as a button itself, eliminating the need for a separate button. The trackpad now supports multi-touch gestures.

One model has a 15.4-inch screen, the 2.4GHz Intel CPU, both Nvidia chips, and 250GB hard drive, and a roughly $2,000 price tag. The $2,500 model adds a 2.53GHz Intel CPU, more memory and a 320MB disk.

The two new MacBook Air models, with prices unchanged at about $1,800 and $2,500, also sport the Nvidia GeForce 9400M graphics chip, replacing an Intel chipset. Apple says the change will boost graphics performance by four times.

The lower-priced model features a 120GB disk, compared to 80GBs previously; the more expensive model now boasts a 128GB solid state disk, compared to the previous 64GB device.