Who is my top talker in real time?

I have a 1.5Mb SDSL connection at my house that is getting soaked. How can I identify who my top talker is in real time?

The aggregate bandwidth graphs are not much help in isolating who it is ...

Thanks in advance!

Attached Images

	saturated.JPG (20.6 KB)
	WAN traffic.JPG (37.6 KB)