DU Meter 4.0 is an award-winning utility. By using DU Meter you can watch your networks data which is flowing through your computer’s network connection.

Keep an eye on your Dial-Up, Cable, ADSL, Ethernet, and others connection: see data coming in or going out.
You can also use extensive reporting (HTML, Excel, PDF and others) , notification and events system.
Provides clear graphical and/or numerical display
Fully compatible with Windows Vista, Windows XP, Windows Server 2003 and Windows 2000

Very useful really [:P]

download here