As long as the sole purpose of answering questions is not to advertise your web site, it's ok to have your link in your signature.
If Yahoo has nofollow attribute in your link that's fine too because ultimately when people recognize your expertise they will be more then willing to click that link to find more info in your web site: that's what matters_ traffic, quality traffic.
Keep up helping others and you will reap the rewards for your expertise.
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