Have a friend (or use a proxy and a separate account) go to Yahoo answers and ask a leading question about the site subject matter. Answer the question and leave a link to the site in your answer. Example: You are putting up a site for a local restaurant. Ask the question: "Where can I get a good grilled salmon in Houston?" Answer: "I just had a superb meal at Tommie's on Greybark. Excellent food and prices." Be sure to use separate accounts for the question and answer. Be sure to use HTTP// in your web site name. I know these links will be no-follow, but the bots follow them anyway, even if they do not count for SEO. I have had luck getting sites and pages indexed within minutes using this method, though it can take a day or so.