I have two Acer 22" monitors (1680x1050 each) and an HP 23" rotating monitor (1920x1200 or 1200x1920). Have been using at least dual monitors since 1997 (when the Win98 beta came out) and I can't imagine not having at least two. Most people don't seem to realize how easy it is to have two or three, and they're CHEAP nowadays!