Imified is an instant messenger buddy that offers access to productivity tools like notes, reminders, and todo's. The site is powered by ColdFusion and their IM bot is done through CFMX7 Event Gateways. However, the most important business aspect is that their back-end / account management is all AjaxCFC! :->
The concept is great because it's simple, yet very handy... I wish them luck and hope they add many more features.
I also wrote a few bots before, but quickly ran into licensing issues with the networks. All networks restrict the amount of messages a single user can send/receive per day, and some networks charge up to $50,000 simply to allow your bot to live.