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I need to know which applications are accessing the internet on my Mac. I want to know how much data they uploaded and downloaded. I got a steep 3G bill this month because some stupid app is downloading something in the background, and I don't know what it is.

All I need to do, is find it, and block it, or turn it off.

Can anyone please help?

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up vote 2 down vote accepted

Try Little Snitch

A firewall protects your computer against unwanted guests 
from the Internet. But who protects your private data from 
being sent out? Little Snitch does!
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Thanks, this is perfect! – josef.van.niekerk May 11 '11 at 10:07

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