Quicksilver is a Mac OS X utility which allows me to use the keyboard to perform quick tasks, such as launching applications or opening files. Among many other things, Quicksilver indexes my address book, so I can quickly find a telephone number or compose an e-mail. When I select a phone number entry and hit Enter, I see the phone number splashed across the screen. Why is that useful? I can concentrate on punching the number into a phone without having to squint at a small address book entry. (BTW, don’t bother dialing that number: I made it up.)