I'm a consultant and an entrepreneur. As a consultant my main job is helping companies set up their web and ecommerce strategies. As an entrepreneur, I'm building my own web sites. For both activities, building and testing my programming skills on StackOverflow is both fun and useful.
Q&A for professional and enthusiast programmers
Q&A for professional programmers interested in conceptual questions about software development
Q&A for linguists, etymologists, and serious English language enthusiasts
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for people wanting to improve their personal productivity
Q&A for peer programmer code reviews
Stack Exchange Network staging zone, where users come together to build new Q&A sites