In the modern office, we waste a lot of time. Much of the wastage is spent re-typing commonly used bits of data: phone numbers, mailing addresses, and answers to frequently asked questions. You can become more efficient by using an application that expands a shortcode to a specific text (ie. "AAmailing" becomes the full mailing address).
On the Mac, I use TextExpander (I even paid for it). On my PC netbook, I use a free app called Texter.