Thanks, GeoffR and PicsesChick.
Hmmm. It's not letting me authorize under my existing account; I'm sure I've got the Adobe ID (email address) and password correct, but it's saying "Incorrect username or password." I wonder, now that ADE 3.0 is out, if they're not allowing authorizations of 1.7.2 anymore.
E_AUTH_FAILED
http://adeactivate.adobe.com/adept/SignInDirect