Leopard Dictionary got a new look.
Unlike old Tiger OS where Thesaurus and Dictionary are separated into two different Applications, Mac OS X Leopard integrates Dictionary, Thesaurus, Apple Dictionary and Wikipedia into one single Application called Dictionary.
From Dictionary to Another Dictionary
Remember how do you change tab while using Safari? Dictionary has exactly the same way of changing its Dictionary Type, i.e. Command-CloseBracket for selecting next Dictionary and Command-OpenBracket for selecting previous Dictionary. Leopard also provides you with really quick navigation through Dictionary Types: Command-1 for Dictionary, Command-2 for Thesaurus, Command-3 for Apple Dictionary and Command-4 for Wikipedia.
Zoom In and Zoom Out
Sizable font makes Dictionary entry readable for everyone. Like how you did to your browser, Command-Shift-[+] increases the text size and Command-[-] decreases the text size. Or the big A and the small A clung at the toolbox should play their role well.
The more I use the Dictionary, the more I feel like using a web browser, with the exception I use Dictionary for surfing across the words. Left arrow and right arrow button on the toolbar help you go back to your previous entry or go forward to next entry.