Yahoo Answers is yet another way that you can drive traffic to your website. People ask questions on this site on a variety of different topics and you can provide answers. Yahoo Answers also tends to rank highly in search engines like Google, and people who need answers can search all the old topics as well as start new ones!
This is great for you when you leave an expert answer with a link to your website. Keep in mind that Yahoo Answers strives to keep the spam away, so make sure that the page you have linked to is actually helpful and relevant.