If you use Mac OS X 10.4 (Tiger) here are 3 interesting things you can do in the Address Book application. 1. Click and maintain your mouse on the grey name in front of a phone number (home, work, ...). A popup will appear. Move to Large Type and the number will appear as large as your screen making it very easy to see. 2. Do the same for an email address and choose Send Email. Your Mail application will open with the name already written. 3. Do the same for an address and move to Map Of and your browser will open with a map to the person's house.