Have you ever wondered what was eating your network? Would you like to be able to check exactly which application was responsible for that sudden spike in outbound traffic? NetHogs might help. This neat little utility calls itself a “small ‘net top’ tool”, and that is exactly what it is. NetHogs groups bandwidth usage by PID so you can immediately see which application is responsible and take whatever action you deem appropriate.
(Oh, and if you want a nice graphical representation of the connections your PC is making whilst you are using it, I recommend you install etherape. It can be a highly educational (not to say scary) experience to leave etherape running whilst you fire up your browser. You will find that your PC is making HTTP connections all over the place. Now try leaving it running whilst you are not doing anything and watch what happens.)