A sneak peek suggests ultraportables from HP and Lenovo may challenge earlier thin notebook offerings. Hewlett-Packard’s new ultraportable, the $1,599 HP Compaq nc2400, boasts a bright, 12.1-inch screen and weighs 3.6 pounds. Meanwhile, the Lenovo 3000 v100 laptop could provide serious competition to Lenovo’s own ThinkPad X60s in some markets. Sporting a 12-inch wide screen and weighing in at 4.4 pounds, the $1,649 Lenovo 3000 v100 has a six-cell extended battery and a built-in DVD+R dual-layer DVD burner.