The term big screen is rarely used in the same sentence as lightweight or ultraportable, but talking about the Sharp M4000 WideNote ($1,799, as tested) calls for this unusual combination. With its amazingly light frame—just 3.7 pounds—this system is meant for the road. The sizable widescreen, at 13.3 inches, is ideal for getting work done, and when you want a break, for watching DVDs.