Melbourne
http://mac.anarchobase.com/, Melbourne Anarchist Club, venue, infoshop and events
http://loopholecommunitycentre.org/node/827 Community/ Social center with Library, kitchen, bike workshop, urban gardening, concerts and Food not Bombs
http://barricade.org.au/news/- anarchist bookshop- located in loophole from november 2009.
Irenes Community warehouse- Food not bombs cooking, mondays and tuesdays, from 10am and 4pm, free computer access, workshops, artspace and concerts
http://www.melbourne.foe.org.au/ Friends of the Earth, with cheap food, environmental shop, food co-operative, environmental projects.
http://thearthouse.com/ The Arthouse, Bar with alternative concerts
Squats are everywhere, you just need to find a person and ask, they are houses not social centers.