In the 4th and final announcement of the Macworld keynote, Jobs announces the MacBook Air.
“MacBook Air is 0.16″ to 0.76″. The thickest part of the MacBook Air is thinner than the thinnest part of the Sony. It fits inside a envelope”

“Magnetic latch, 13.3″ widescreen display”
“Move a window by double-tap and move. Rotate a photo by pivoting your index finger around your thumb. Of course, pinch-zoom.”
“1.6 GHz Standard, 1.8 GHz Option — Intel Core 2 Duo”
“Apple asked Intel to shrink the Core 2 Duo. Intel shrunk the processor by 60%.”
“80 GB hard disk standard, 64 GB SSD as an option. ‘they’re pricy, but they’re fast’”
“5 hours of Battery Life”
“802.11n + Bluetooth 2.1/EDR”
“45 Watt MagSafe, 1 USB 2.0 port, Micro-DVI, Audio Out”
“No optical drive, but a Superdrive accessory is available for $99. Also, software comes with the MacBook Air that allows you to “borrow” a Mac or PCs optical drive”
“2 GB of Memory Standard”
“Pre-orders today, shipping in two weeks”
“Environmental highlights: fully aluminum case (good for recycling), first fully mercury and lead free display, circuit boards are BFR free, retail packaging are 56% less volume than MacBook.”
“$1799″

Fits inside envelope.

More to come!