Twitter is difficult to use because it's so easy to use. Once you've created an account, your Twitter page allows you to update your status and watch a scrolling list of status updates from your friends.
Stories by Joyce Carpenter
Nicholas Carr, of IT Doesn't Matter fame, spoke with Computerworld's Joyce Carpenter about his new book, The Big Switch: Rewiring the World, from Edison to Google.
Whitfield Diffie, a co-inventor of public-key encryption, is chief security officer at Sun Microsystems and co-author with Susan Landau of Privacy on the Line: The Politics of Wiretapping and Encryption (The MIT Press, 2007).