Perth has a Pride festival. This year CHOGM is being held at the same time that Pride is usally on and that means accommodation is booked out and all that shit. I think Pride is being shifted, but I don't know when.
The nightclub and Pub mentioned are fun (Connections and the Court). Haven't been for ages though.
For local GLBT information in WA, check out this website:
http://www.outinperth.com/
And sorry I didn't get to meet you in Darwin when you were here. I was overseas. Hope you had fun though, and have an equally awesome time in Perth. Despite the isolation, it's a nice place.