Just a reminder that for every one of your interests, there are at least ten publications that cover it and possibly ready to pay you a lot of money. Just because you haven't heard of them doesn't mean they're out there. Read (a different) Stephen King's story of how he started getting paid to write about his hobby, snowmobiling, as inspiration. (Writers Weekly)

Get looking for the trade magazines that tailor to what you like. You can find some on Yahoo.