There is an Au Pair chatroom on the Nanny forum.
I've tried Cultural Care first. It was a very painful process b/c they allow host families and aps each 6 connections. You can only interview with aps who connect with you, so these aps are simultaneously interviewing wit 6 families. I could not count how many aps I've reached out to never even bothered to respond. After a frustrating and fruitless search, I switched to Au Pair Care. Their process favors host families slightly more. HFs can interview 3 aps at any given time, while each ap can only interview with 2 families. Basically, it forces aps to make decisions relatively quickly, whereas the CC model allows aps to shop around for perks.