America Online today announced the availability of the Open AIM Instant Messenger SDK on their developer site, developer.aim.com.
Using the SDK, you can build:
Greg's Blog has more information, but the good news is that you can use VB, C#, or C++:
For now, lets concentrate on the Open AIM SDK and get into what it can do for you. First, the development kit is written using COM, so plugins and custom clients can be written for Windows in languages like C++, VB, C#, and eventually J-Script.