Ask HN: iPhone application tester community

Does anyone know of any good community site where I can get people to test out my upcoming apps? I want to run a beta test session before submitting the app but can't find a place to find good testers. Running beta is hard on iPhone platform but if there was a site that offered me the ability to pick the kind of testers (experience and device type) that I am looking for and then select them as my testers would be BIG. Any ideas? suggestions?