IM versus Phone

I enjoy IM much more than phone. Of course phone is best at times.

However, mostly, I really enjoy IM

• IM doesn't have the "urgency" attached to it - I can solve a request on my own time
• IM is logged by default (while phone is not recorded by default)
• sometimes you forget things over the phone, while with an IM, you can later remember them

What do you enjoy?