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 two seconds. For the money, you'll get an ultra low voltage Core i5 CPU, 4GB of RAM and 20GB of solid-state storage combined with a 320GB HDD. No word yet on how many additional configs will be available, though Acer did confirm that this $899 version will be followed by models with Core i3 and i7 processors and beefier storage capacity. Intrigued? Have a gander at our hands-on preview if you missed it the first time around, and find some fancy press shots below.