I like solving problems. I try to research and/or deliver solutions that are faster, better, more reliable ways of doing things.
I've found StackOverflow and various StackExchange forums invaluable. I rarely ask questions because judicious and patient searching normally finds an answer, or at least an answer that is 99% of what I want/need.
I enjoy answering questions because they give me the opportunity to give back to the community at large.