Jason Calacanis points to WSJ story that suggests size does matter:

“Researchers at the University of Utah tested how quickly people performed tasks like editing a document and copying numbers between spreadsheets while using different computer configurations: one with an 18-inch monitor, one with a 24-inch monitor and with two 20-inch monitors. Their finding: People using the 24-inch screen completed the tasks 52% faster than people who used the 18-inch monitor; people who used the two 20-inch monitors were 44% faster than those with the 18-inch ones. The study concluded that someone using a larger monitor could save 2.5 hours a day.”

I think that balances out the 2.5 hours a day I goof off. [Thanks, David]