Telstra and Internode, two of Australia's largest ISPs, now say they won't participate in tests of a massive new filtering plan by the Australian Government. The plan, one of the most elaborate and expensive filtration efforts ever attempted, will include two blacklists -- one which filters illegal material (no opt-out) and another that filters material deemed offensive by the Australian government (users can opt out). The nation's largest ISP, iiNet, has said they'll participate -- but only to clearly illustrate to the Australian government how technically impossible and "stupid" the program is.