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 The Internet moves quickly, and something in one issue may be out-of-date by the next (although I'm usually correct as of the day the issue is dated, since I check URLs during editing).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:
Enabling Auto Spelling Correction in Snow Leopard
In Snow Leopard, the automatic spelling correction in applications is not usually activated by default. To turn it on, make sure the cursor's insertion point is somewhere where text can be entered, and either choose Edit > Spelling and Grammar > Correct Spelling Automatically or, if the Edit menu's submenu doesn't have what you need, Control-click where you're typing and choose Spelling and Grammar > Correct Spelling Automatically from the contextual menu that appears. The latter approach is particularly likely to be necessary in Safari and other WebKit-based applications, like Mailplane.