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.
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).