“I want to connect 2 external monitors to my laptop, but it only has one video port. Is there some kind of add-on I can get to connect a second monitor”
There’s plenty of evidence to indicate that using two screens are more effective than one; at least up to a certain point. There’s also a strong indication that those two monitors need to be the same size, since your visual receptors appear to get confused by screens of different sizes.
A recent Utah study indicates that using 2 20-inch monitors allowed people to complete tasks 44% faster than using 1 18-inch monitor, making a pair of 20-inch screens from Dell for under $600 sound like a steal. Since many people I know have switched to using a laptop as their primary machine no matter where they are, the trick of using two monitors (at least when docked) can be crucial.