I've thought about adding this, but in the end feel the server's get hammered enough as it is with just the normal usage around here.
I added the ICQ option in the profiles so people could leverage that a bit if they chose to. AND there is always chat and email...
I'll reconsider it again, but after a number of upgrades to speed are in place. The last thing I want is to take a hit in performance for something like this.