This is an interesting idea and perfect for me since I have constant access to aim wherever I am through my phone, the sk3.

Imified is an instant messenger buddy that works across all major IM networks and offers access to a growing number of web applications, as well as productivity tools like notes, reminders, and todo’s. Imified helps you get things done faster.

I particularly like how you can add appointments to your google calendar, something I use religiously! To sign up just message these bots according to what chat network you use:

AIM: IMified
Yahoo: IMified
MSN: imified
Google Talk/Jabber: imified