I've got a lot of programming experience and want to start earning some money but wanted to get peoples feedback on some ideas. If you were to start/start over in a new business, what area would you invest in? There are lots of markets to get into but whats proven to be best market to get started in today? Like: iOS apps for iPhone/iPad; apps for Android devices; Software applications in medical field or other niches; upcoming Windows 8 targeted apps???