I really never liked IM, but a few of my bosses and peers do, so I suppose I'm going to have to deal with it one way or another. In general, as I mentioned in an earlier post, I'm in a non-GTD, but very successful, company, and IM-ing each other is part of a somewhat urgency-addicted culture.
I would say most of the IMs I've received don't really deserve interrupting my attention... but what can you say to someone IM-ing you?
Maybe I just don't *get* IM. Almost everyone has a cell phone or has their email, ... why do you really need IM?