If you are distributing an early-access of your product first, the first 100 users could be beta testers. I have gathered an initial community of people using my app by posting to directories like betalist.com, betapage.co etc.
That is a great strategy. These beta users might be less critical if the app does not work the way it is supposed to work too. So this takes a big pressure off the shoulders of the developers.
As a follow up question: Can you share some sites/sources which you would recommend.
