I am currently having to access the internet through a wireless dongle which is giving me a 2gb per month download allowance. I need to be really cautious about my internet usage.
Just this afternoon I ran out due to some process downloading 600mb of something. I have no idea what it was (although I suspect iTunes) or why it would need to download so much.
Is there anyway I can monitor which processes are using the network, or failing that set up a firewall that only allows the apps I choose to have access?