A number of people wrote to tell me that John Norstad has released NewsWatcher 2.0b3 shortly after TidBITS-233 came out, mentioning 2.0b2. The Internet moves quickly, and something in one issue may be out-of-date by the next (although I'm usually correct as of the day the issue is dated, since I check URLs during editing). You can get NewsWatcher 2.0b3 (and subsequent versions in the same directory) at:
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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?