Question: How do I contact someone who has answered my question to thank him/her for the answer? I've gotten some really good advice from people on questions I've asked and would like to thank them for the help, but I don't know how to contact them.

Answer: When you choose your best answer there is a space provided to add a comment. You could thank them for their help in that space. After you choose the best answer a notice is sent to the person's "answer page" to tell them that one of their answers has been chosen as best and that they recieved 10 points. They can click a link on that page to take them to the question they answered where they can see your comment about the answer.
This question from the Yahoo Q&A forum is categorized in the topic: Science & Mathematics