We review 31 notebooks, 9 of which have all or part of the Centrino platform. Our roundup is divided into four categories: desktop replacement notebooks, value notebooks, mainstream notebooks, and ultraportable notebooks. Desktop replacements average about 8 pounds and cost anywhere from $1,350 to more than $3,500. Such a notebook can replace your three-year-old desktop PC, saving precious counter space and giving you the added bonus of portability. Perfect for the home roamer, desktop replacements free you from your desk, letting you move from your office to your kitchen or family room.