Oh. Addendum to the last post. If you're connected to an ISP in Australia, then chances are you're already going through proxy server. Australian ISPs are charged for their bandwidth per byte downloaded, so the caching web proxy is the first line of defense against huge bandwidth bills.

And as an aside, a friend of mine who works for iiNet in Perth tells me that the traffic flowing over their network as a result of the Morpheus file-sharing software is 1.5Gb every 20 minutes, which costs the ISP approximately $30,000 per month.