First available in Japan, it appears Sony's 11.6-inch Vaio YB notebook is now shipping stateside as well. US customers can order the Fusion-based ultraportable through Sony's online store
and it should be available through Amazon
shortly (the product page is up but it's still listed as a preorder item).
The model via Sony (VPCYB15KX/S) is priced at $600 and comes with an 1366x768 display, a dual-core 1.6GHz E-350 (Zacate) APU, on-die Radeon HD 6310 DX11 graphics core, 4GB of DDR3 RAM, and a 500GB HDD. The Amazon device (VPCYB13KX/S) is $550 with 2GB of RAM and 320GB of storage.
Connectivity includes gigabit LAN, 802.11b/g/n Wi-Fi, Bluetooth 2.1+EDR, three USB 2.0 ports, VGA and HDMI outputs, as well as an SD card and Memory Stick reader. Battery life is rated at six hours when running at the "default" brightness or about five and a half hours if you crank it up to the max.