Sites like Yahoo Answers a are a good way to market your site, i would like to become a member of all the other popular answers sites too. Has anyone compiled a list of such sites?
I have answered lots of questions on yahoo answers, if i can squeeze my sites into the answer then i do, i never really try to push them in, therefor i can not tell you if it affect anything or not.
The best places to answer questions are at the following -- http://answers.yahoo.com http://www.answers.com http://askville.amazon.com
Www.funadvice.com is one website that I know of where you can ask questions. It is also known for celebrities answering teenagers questions.
try these list of yahoo answer like sites: http://helpmyinternet.blogspot.com/2007/09/what-is-knowledge-market-website.html
Another site to look at is Quextit. They have a public service but also have a "Q&A Engine" that lets you host your own Question and Answer service. Easy to integrate. You can get more info at: http://qna.quextitmc.com/. Quextit is a sponsor of Dean Kamen's FIRST Robotics Competition and provides the Game and Technical Q&A which they host on their own site. Just google "FIRST Robotics Competition Q & A".