I just got a great IM reference question that wasn't easy, and I hardly even scratched the surface of what the person was asking for when they thought I was done and left. I have no idea who the person is, so I can't prepare a great e-mail full of much better information. I wasn't very helpful, but I had used an ellipsis in my last post to the person.
I'm not a big fan of the IM format. It doesn't get much use and I'm not sure what I could have done differently in this situation. Despite all of the talk about IM, I don't believe it will grow in the future.