Created my own recipe search during uni that gives you ideas based on what ingredients you have lying around.
The Guardian newspaper bought it and now I work freelance for them pretty much full time.
Q&A for professional and enthusiast programmers
Q&A for computer enthusiasts and power users
Q&A for professional system and network administrators
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for statisticians, data analysts, data miners and data visualization experts
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games