cheaper ways
Well, there are other ways to gain exposure than merely by throwing money at things.
If you make sure that your web site is designed so the search engines pick it up easier, then you will stand a greater chance of being picked up faster. A decent web designer should know what to do. so make sure that search keywords appear on your web site more than 1-2 times. However, if you have hiden words, they will consider your side spam, and will not list it.
Also, if you want to get onto Yahoo with a stable listing, then start by using google. submit to google, and pay for a one-time submission to a host of search engines, I used submit it for my site.
Also, make sure that your site is listed in coffeeforums, coffeehits and the other coffee web sites, as links always helps you in getting your ratings up.
Once you start to appear on the second or third page on a google search, people will start to click on you and then... You might end up on page 1 on yahoo having spent a mere US$70 on the site AND a one time submission on a submission service...
I am not saying that Overture and similar services are bad, if you want to pay for every time someone clicks on your link. But... there are cheaper ways as well...