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as I am new to raspberryPi and xbian I gues that there is some addon or something to see this but here is nice script so you can track it over your smart phone

http://www.madmadmod.com/sysadmin/54-how-to-get-the-current-network-bandwidth-usage-on-linux.html

https://www.dropbox.com/s/hkcqshyrphol9eu/2013-01-18%2000.12.50.png

Thanks for sharing