I had an idea for an application a while back, inspired by something from one Bruce Sterling novel or another. The Mook was going to be a chatbot that you could install, which would pretend — in a very limited fashion — to be you if you didn’t want to / couldn’t IM but wanted people to be able to get certain information. The Mook would tell people where you were, what you were doing, and — if they were on a certain list — your contact info.
Now we have Twitter. Which obviates the need for such a thing.