Lenovo's ThinkVision LT1421 is a great dual-monitor solution for laptop users. It's light and easy to carry and draws all its power from your laptop's USB port. Its picture quality isn't great, but that's not the main selling point of the unit -- it's meant to provide great convenience for those of you who need to work with extra screen real estate while on the road.

The Lenovo ThinkVision LT1421 portable USB-powered monitor makes for a great addition to your travel bag with its slim profile, included cover, and straightforward, one-cable connection. The monitor performs best as a secondary display for email, text, and reference material, though I wouldn't rule out sneaking in the occasional video while you work on your main screen. ...