Ask HN: Place to recruit Android Beta Testers

This may apply to Android or iPhone developers - I'm looking for a central location to find qualified users to test my Android app (.apk file). Ideally I would send it out to my friends that have Android phones, but they aren't the most technically savvy so it would be difficult to get them to install the app. I'm looking for about 10 users to test an app across different phones and OS's.