SecureMac has released MacScan 2.9, which updates its malware blocking utility for full compatibility with Mac OS X 10.7 Lion. The latest release of MacScan, which includes the most recent malware definition signatures, can now also quit all running browsers when a scheduled scan is executed, and automatically checks for new updates by default when it is first run. ($29.99 new, free update, 5.6 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?