Privategirls is a good one. I would be careful with cracker as it has some pretty mixed results. In addition it is legal here but ONLY if the lady/premisis are licenced, and laws vary state to state. When you jump on cracker if you plan to answer an ad and want to be sure your not going to get in the shit, look for the ladies provider number, many proffessional ladies list it with their ads, it is normally a SWA or PCA prefix. There has been a bit of a crackdown in Victoria around unlicenced brothels, and as a tourist I dont suppose you want to get mixed up in that. Also have a look at punterplanet, for reviews and links