The mobile applications market has exploded in recent years, with Apple’s App Store surpassing 300,000 applications and the Android Market continuing to gain ground. Apple and Google’s crowdsourcing strategies and the market’s low barriers to entry have set the standard and convinced dozens of individuals — regardless of experience — to become mobile app developers. A survey of 331 respondents derived from our readership at TheAppleBlog and jkOnTheRun looks at trends among mobile application developers, including average income for a developer, the most popular app platforms, the rising popularity of tablet applications and the in-app advertising vs. paid and/or low-cost apps. Companies mentioned in this report include Apple, Google, Research in Motion and Nokia. For a full list of companies, and to read the full report, sign up for a free trial.