Another challenger enters the ultrathin notebook arena. This time it's NEC, prepping its lightest and daintiest edition of the UltraLite line, the Type VS. Its thickness ranges from 15.8mm to 29.9mm, comparing unfavorably to the 19.4mm MacBook Air or the 16.51mm Adamo. But, its 725g weight (about a pound and a half) definitely undercuts the competition, and its three USB slots, Ethernet port, and SD card reader give reasonable connectivity without external adapters. Its 10.6-inch screen has a r