Apple has released Thunderbolt Firmware Update v1.1, which addresses a problem with the mid-2012 MacBook Pro (when using certain Thunderbolt cables) that prevented some bus-powered Thunderbolt devices from working as expected. The update requires Mac OS X Lion 10.7.4 or later. (Free, 442 KB)
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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?