The ultralight Vaio Pro 11, Pro 13, and Duo 13 slider will all be made available by the end of this week starting for $1149
http://www.notebookcheck.net/Sony-launches-Vaio-Pro-11-and-Pro-13-world-s-lightest-Ultrabooks-to-date.93703.0.html
Sony Vaio Pro 11 is a really thin and light laptop made to compete with Apple MacBook Air; this ultrabook is made for people who like to travel a lot; but it is also expensive. http://www.techiecop.com/laptops/sony-laptops/sony-vaio-pro-11.html