jaymz: For those complaining that their steam download was on the metered connection, i suggest you read this:
http://www.telstraclear.co.nz/sub-sites/gaming-steam/steam-faqs.cfm
Particularly the point that says:
"While TelstraClear have aimed to mirror all of the available Steam content, due to the extensive games catalogue Steam offers which is regularly being added to, neither TelstraClear or Valve can guarantee that any content downloaded through the Steam client will be sourced from the unmetered TelstraClear Steam Content Server. We do expect the majority of users content to come from our server none the less."
And on their faq it links to third party applications that get past this limitation... its kind of a mixed message dont you think? "hey you may get charged for it, but use these applications"
And anyway surely blocking any outgoing/incoming connections from steam except the KNOWN tc server would also help