Hey Pierre,<p>Thank you for this post. First, because I use your apps with my kids and they love them. Almost certainly one of the reasons your applications sell is because they are very good. It was recommended to me by a relative who is a teacher and I know she recommends it to others. These types of applications <i>are</i> the reason I purchased a tablet device: I am a very stingy person, but if a tool will engage my children in learning, I am happy to separate with my cash. (we use the app with our kids together)<p>Second of all, it is just good to have this perspective on the market potential for a well made app. I'm disappointed about the Android market, I hope it improves.