The ThinkVision sports a 1366x768 resolution (720p for you media centric folks out there) and has a nice crisp image. The reason I opted for a USB monitor is because my favorite netbook lacks a standard video out port (plus now with my normal laptop I can have a three monitor setup!). Another thing worth mentioning is that is addition to connecting to your PC via two USB ports - the ThinkVision also draws all of it's power through USB, meaning you won't have to scramble to find an additional outlet when using this extra screen.
So far I've just been using the screen as a nice large terminal at home when using my netbook. I have several weekend trips planned for this summer and the ThinkVision is designed to be mobile. It has a built in stand:
and it comes with a protective plastic cover that can clip over the screen when transporting the monitor.
Like a good deal of hardware the ThinkVision only comes with a driver disc that supports Windows operating systems. Thankfully the screen uses the same display driver as most USB display adapters - DisplayLink. OSX users can find a driver download here and my fellow Linux users out there should be happy to know that DisplayLink drivers have been in the mainline kernel since the 2.6.38 release (meaning they are included in most modern Linux distributions by default).
The price tag on the ThinkVision is 200 USD and you can pick one up directly from them here.