The Growl Project has released Growl 2.0, a major update for the system-wide notification utility that brings compatibility with Notification Center in OS X 10.8 Mountain Lion. With this new release, you can set Growl to route all of its notifications through Notification Center (rather than use Growl’s standalone pop-up notifications). However, you’ll still find some apps (including Dropbox) using Growl’s notification system instead of forwarding to Notification Center due to the requirement that developers update their apps to the Growl 2.0 API. The update also adds support for Prowl and Boxcar, two utilities that enable you to receive notifications from your Mac on your iOS device. It also reportedly resolves the high CPU spikes and multiple crashes suffered by the previous version. ($3.99 new from the Mac App Store, free upgrade from previous Mac App Store versions, 6.1 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?