Over the last couple of months I have designed and written Keys, a Mac application the helps learning typing and that is supposed to meet Mac users standards for a well-designed application.
My goal is to become a micro-ISV or indie developer. The app is only in the Mac app store for now (no trial yet), since end of May, and I have been busy putting together a website and a personal blog since.
I would be very interested what the HN community thinks about the application, how you like it, and how it is presented, from a business angle. Prior to this project, I have done much more work on server side software without any UI so design and marketing aspects are new to me and advice is very welcome.
Product website:
http://getkeysapp.com
Announcement blog post:
http://florianebeling.com/announce/mac/typing/2012/06/11/announcing-keys-app/