And the Ultrabooks have arrived! We just got word that the Acer Aspire S3 will go on sale in the US and Canada this week for $899 -- making it the first pinch-thin, MacBook Air competitor to hit the market, landing ahead of competing models from Toshiba, Lenovo and ASUS. To recap, this 2.98-pound aluminum beaut has a 13.3-inch (1366 x 768) panel, is rated for six hours (or 50 standby days!) of battery life and promises to wake from sleep in a mere 2.5 seconds. For the money, you'll get an ultra low voltage Core i5 CPU, 4GB of RAM and 20GB of solid-st
