As performance improves and prices continue to go down, laptops increasingly replace desktop PCs at work. A laptop offers a number of advantages, especially portability. Even if your work doesn't call for much travel, a laptop allows you to take all of your data with you on a daily commute or down the hall for a presentation. Most of today's notebooks are just as capable as basic business-desktop PCs and require much less desk space. The best business laptops combine portability, performance, battery life, and integrated wireless networking. Here are five business laptops that CNET readers have deemed the best of the best.