you can using google adword. But alternative way you can buy traffic 5k for $60 for targeted traffic. Search in google for info. choose the best service with worthit site and have good reputation. Don't try cheap targeted traffic! because the traffic is robot. Targeted by Category and delivered in the form of High Quality Popunders and "Pop-Ins" (embedded windows to the publisher website).
yahoo seems to put alot of emphasis on tons of links for a keyword, so organically, you need alot of links, same with old msn... but bing is alot more like google.
Increase backlinks from aritlce directories, directories and other sources. Increase the keyword density of your target keywords in the title, meta and content of the pages. You will get some success in yahoo but on the other hand google may penalize your website. For google, the keyword density should limit to 3%. Also agree with others, yahoo answer is the best source of traffic. But remember if you put the link of your website, it should be useful for the person asked question. Yahoo buzz is another option to get traffic from yahoo. For getting success here, your content should be interesting, and friends with yahoo id to vote on your submission.
hmm means if we are using yahoo products then its good for us wow strange but i think it really works