Bingo! The Mobile Buddies tip worked.
But now I realize there is a significant bug in the AIM software. It won't remember the notification setting. I keep setting it to flash/no sound and it just forgets the setting and does nothing instead.
It also takes a lot longer to load than Ramble but Ramble doesn't seem to have the option of visual notification with the flashing light. Purple would be cool!
Who do we report these AIM bugs to??