This is another one for the department of the obvious, but I finally noticed that it's quite easy to add words to the system-wide dictionary (the Public Beta had no means of adding words). The dictionary is used in Cocoa apps such as OmniWeb, TextEdit, and Stickies.
To add unknown words, simply control-click (or right click if you can) on the underlined word, and you'll get a contextual menu that contains suggested corrections, as well as "Ignore Spelling" and "Learn Spelling". Cool!
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20010421084238317