Hi Scott,
Double check the AIM application Groups.
It does not matter where you place them in the Address Book
The Groups are held at AIM on their servers. The Address Book only holds those that you add extra contact info to such as a "real name" or an Email address.
The AIM Application certainly puts all new contact in the Recent Buddies group.
I am not entirely convinced moving people to new groups in this app does not duplicate the entry.
More than likely this is some oddity that is going to be cured by deleting and re-adding the Buddies and not the fact you have the Buddies in different groups in different applications (even though you use the same screen name yourself)
I had not thought of using iChat's groups feature to effectively sub divide an AIM Buddy list this way by only having some of your groups in iChat.
When you did turn off Groups did all the Buddies appear in the Buddy List.
(or have I misunderstood part of what you are telling me ?)
10:09 PM Tuesday; July 31, 2007