If you're on FB there is a group just called Same Sex Parents - it doesn't specify Brisbane in the title but 90% of the members seem to be lesbians from this part of QLD. It's the most active group I've been on of this sort. Lots seem to be around but nobody posts anymore - this one is still quite busy - there's a meetup in New Farm this Sunday. There's also a Yahoo group called RainbowkidsBris that has regular meetups - one this Friday.