Ever wonder what traffic is eating up all your downloads?
If you have a linux server, you can install a couple of tools to do this.
I initially found vnstat - http://humdi.net/vnstat/ but it doesn't do per ip, so thats no good.
Next I found ntop - http://www.ntop.org/ but it looks quite complicated
I decided to use darkstat - http://dmr.ath.cx/net/darkstat/
It was dead simple to install, has a built in web interface, and works a treat, and uses absolutely minimal cpu.