I tried using the linksys router's built in log table thing, but that doesnt really help. I would like to have the IP where the name is as well. so you would see:
John Doe: 24.55.78.222: Hello, my name is John doe, and I'm a crazy stalker.
I think it's a little more complicated - aren't all IM's forwarded through an IM server (whether AOL or MSN)? If that's the case, could you actually see a "real" IP address, or just the address of the IM server?