As a kids iOS dev, I'd also like to thank Lorraine of "Moms With Apps" for her support. "My PlayHome" & "Pocket PlayHome" are just starting to be profitable but at the start Lorraine really helped get things going and is still actively helping me get the app out there.<p>Lorraine also gave me some advice which I think is really the "secret" of your success: Make a really good app.<p>Tangentially, I've found Twitter to be remarkably useless for marketing. For the most part on Twitter, nobody is listening. Everyone has thousands of followers but nobody is actually reading. Thanks to bit.ly's public analytics, I can see it's not just me either.<p>The biggest event for me on Twitter was when @glinner (Father Ted, IT Crowd, <i>hugely</i> influential tweeter) tweeted a recommendation: <a href="https://twitter.com/#!/Glinner/status/103123278650028032" rel="nofollow">https://twitter.com/#!/Glinner/status/103123278650028032</a>
...and that resulted in about 40 extra sales. 40.