In Australia, they're looking to block all sorts of sites, not just poker. Quite a few of the sites are porn sites and other less desirable places that the Australian government doesn't want people to visit. As is always the case in regards to these filters, it will also block plenty of sites that shouldn't be blocked and are completely appropriate, such as certain Wikipedia pages and Wikileaks, which has the list of sites blocked.
http://en.wikinews.org/wiki/Portions...a?curid=122986