To be honest im not sure where to post this, so ive gone to the nice hidden area where proven developers lurk :)
I put my app out for beta testing on WPCentral a week or 2 ago and got a few people interested (not much feedback though!) However 1 guy was interested and gave some initial feedback, he then told me he could translate it and he had uploaded the xap onto his Chinese piracy forum!
So be wary of people who wanting to beta test your apps, because they might just steal them and give them to everyone.
Moderator/Admin, feel free to decide what to do about the person, if you want more details please PM me as I don't want to name and shame if people are ok with this.