Steps 2 and 10 of the Mac OS X instructions at
http://code.google.com/p/android-notifier/wiki/GrowlHowto are
incorrect.
The steps should be:
1. Stop AND if it's running
2. Launch System Preferences and select Growl
3. Go to Network tab
4. Select Listen for incoming notifications
5. Select Allow remote application registration
6. Do NOT set a server password
7. Go to General tab
8. Click Stop Growl then Start Growl
9. Start AND
10. Locate AND menu icon and select Preferences...
11. Select Growl Notification Transport Protocol
12. "Android Notifier" should appear in the Applications tab of
Growl after 5-10 seconds