looks nice but clientside applications are useless for reliable monitoring usage, especially on a multi-box household.
most client side b/w usage monitors lose a usage of a session if your computer is rebooted inadvertently ie bsod or total freeze, kidz or the mrs pulling the plug from the kidz comp
heres a nice small one if you find that intrusive called netstatlive from
www.analogx.com
still if we have the need by the isp to monitor usage we need a web interface server side to see what is going on.