I’m a fan of USB mini-monitors. They’re super handy if you’re a photoshop’r or to house Tweetdeck, but they can also get a little expensive and sometimes cost more than full size LCD monitors. But these from DoubleSight are little more on the affordable side. Plus, there is a webcam add-on for the larger model and everyone loves webcams.
The 7-inch model sports a 800 x 480 screen and runs $120. But for $140, you can snag the 9-inch model that can do 1024 x 600. Or for $160, you could get the 9-inch model with a little webcam. Both models are powered by USB and can be used either in landscape or portrait mode.