ASUS just announced its first line of Ultrabook PCs under the new Zenbook brand at a press event in NYC. There are a total of five models in the Zenbook lineup ranging in price from $999 to $1499 and available in both 11.6-inch and 13.3-inch display configurations. Based on specs alone, the Zenbook lineup is very similar to Apple's 2011 MacBook Air. Dimensions are almost identical, although ASUS' 11 is a little heavier than Apple's while its 13 is a little lighter. The entire Zenbook lineup ships with 4GB of DDR3 memory and all of the systems use the same ULV Sandy Bridge parts that Apple uses in the MacBook Air. Battery capacities are identical to the Air models at 35Whr and 50Whr depending on the chassis size. ASUS does claim lower standby numbers than Apple (up to 10 days vs. up to 30 for the MBA), but that's likely an OS limitation. The Zenbooks typically give you a larger SSD than Apple (and 6Gbps on top of that) as well as a single USB 3.0 port to complement its USB 2.0 port. ASUS claims a 2 second resume time for all of the Zenbook models, presumably from a suspend-to-RAM state.

The first Zenbooks will be available for order in the US starting October 12th. I've included some head to head comparisons between the various Zenbook models and their MacBook Air counterparts below. For the most part the specs aren't all that different. I don't expect that there are a ton of users who cross-shop similarly priced Macs and PCs, the Zenbook simply looks like a good option for those users who want a MacBook Air but prefer Windows 7.

ASUS' 13-inch offerings do have a higher resolution display than their Apple counterparts (1600 x 900 vs 1440 x 900). We're still waiting to hear back on the panel technology used in the Zenbooks, but I would be surprised if it was anything more than plain-old-TN like the Macs. Compared to the upgraded MBAs however, ASUS' Zenbooks do offer higher clocked CPUs at the same price point.