When I decided to quit my job and have a go at developing a new Chinese language service, I decided to release first on Windows Phone for a few reasons. For starters, WP is the only phone I want to carry around and Microsoft's development tools are far and away the best of any platform.
Like many other WP fans it bugs me that Windows Phone users get many apps last, if at all. Developing first on Windows Phone allows me to do fast prototypes, figure out my business model much more quickly and serve my fellow WP enthusiasts by bringing quality apps to them first, not last.
So I'd love to be part of the WPCentral Developer program. My app teaches Mandarin Chinese and is called HANYU.CO.