Various configurations of the recently-announced Acer Timeline ultraportables are now available for preorder. Since they’re Windows 7-based systems, they’ll ship this Thursday, October 22nd when Microsoft’s new operating system is released.

Amazon has them starting at $550 for the 11.6-inch model, Newegg.com has them starting at $600, and there are undoubtedly several other stores that are either currently taking preorders or will begin taking preorders soon.

The Timeline series, as you’ll recall, features low-voltage Pentium CPUs and promises up to 8 hours of battery life while keeping system weight between 3 and 5.5 pounds depending upon screen size.