Choose View links by category "club", hit go, and you've got most of the Aussie racing clubs!
For Victoria, these are good: http://home.vicnet.net.au/~bcc/ - Brunswick CC - publishes Winter Road Races for Melbourne's north and west.
Last year, Blackburn CC published Winter Road Races for Melbourne's east, but I couldn't get onto it! Maybe Carnegie-Caulfield http://www.carnegiecycling.com.au/index2.html would be worth a try.
Victoria's racing body - Cyclesport Victoria - http://www.viccycle.com.au/ . It has lots of stuff, but not very up-to-date. There's a club listing, but no links to websites.