Hewlett-Packard has introduced a new wave of Envy and Pavilion thin and light laptops, including an 11.6-inch touchscreen model priced aggressively at $399. The lineup includes three TouchSmart laptops with touchscreens and two non-touch laptops. The less expensive touch models, the $399 Pavilion TouchSmart with an 11.6-inch screen and the $529 Envy TouchSmart 15 with a 15.6-inch screen, have Advanced Micro Devices' latest chips. New AMD chips code-named Kabini, Temash and Richland were announced on Thursday.