I'm a pretty good typist, but my thoughts still race ahead of my fingers, so it's nice to have a utility for entering frequently used words and phrases by typing just an abbreviation

Ergonis software, whose PopChar and KeyCue utilities have been mentioned in TidBITS, now throws its hat into the typing assistant ring with Typinator. The idea is that you provide Typinator with a set of abbreviations and expansions; when you're working in any program, if you type an abbreviation, Typinator substitutes the corresponding expansion