A new AIM version was released today (July 31st) on the AOL AIM website.
New in AIM 5.2.3290
Encrypted IM
Now you can send and receive encrypted IMs! AIM 5.2 introduces the ability for AIM members to send and receive end-to-end encrypted messages - IM, Chat and File Transfer - allowing for message privacy and member identification. Messages are encrypted and decrypted using industry-standard encryption methods - messages sent between AIM members can be digitally encrypted and signed.