I've got coffee shops, letters, phone, texts, email and facebook - that's already too much to be going on with. Anything that increased the traffic coming into my phone would drive me nuts. I do google talk with my friend down in New Mexico, too, because it's quicker and easier than skype or whatever. The thing is, when I communicate with people, I want actual conversations, not telegrams.
Actually, I really enjoy google talk, because it gives both of us more time to think how we want to reply, and there's no sense of pressure like there is in a phone conversation - but it's more immediate than email or whatever. Plus I can choose a backing track for the conversation