Apple has released a Snow Leopard driver update for Lexmark printers that "includes the latest drivers for printers you have used on your system." More information on supported Lexmark printers is available from Apple's Web site. The update is available via Software Update and the Apple Support Downloads page. (Free, 121 MB)
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Constant Dictionary Definitions
If you hold down Command-Control-D in a Cocoa-based application that supports AppleSpell, you'll see little dictionary pop-ups for each word that you mouse over. Neat, eh?