Yahoo! actively edits spam out of their search results. If someone with whom you are competing is not complying with Yahoo!'s guidelines, you may want to point that out to Yahoo!. There is a chance that Yahoo! will remove your competitor's site if they deem it as spam. Again, most of the time it is recommended that you do not use spam reports unless you are prepared for webmasters to play hardball.
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Yahoo! usually lists a site within about a month. The best way to get your site submitted is by building a strong linking campaign. If you need to get your site indexed quickly, Yahoo! does have two paid inclusion programs. Search Submit Pro is recommended for large databases that are hard to crawl, sites with rapidly rotating inventory, event sites on a tight deadline, or sites that need the tracking provided by the program.
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Yahoo! created a free question-answering service and includes many of these questions and answers in their search results.
The idea of integrating Yahoo! user questions and answers directly into the search results shows how much Yahoo! wants to keep their users on the Yahoo.com domain and how much Yahoo! wants to be the most important content site on the web. Compare that strategy to Google who wants to send away visitors as quickly as possible and hope they come back.
Looking for an easy and efficent keyword ranking tracker? I found one 
Shawn Hogan's Digital Point keyword ranking tracker allows webmasters to track their Google, Yahoo!, and MSN rankings for free, although it will require you to place a php page on your server.
You can also look for other Yahoo! SEO Tools at the Yahoo! Developer Network.
Mike Grehan interviewed Jon Glick of Yahoo! Search, and he stated that the meta description tag is treated similar to page content. He also stated that the meta keywords tag is used for inclusion into a subset of search results, but has no effect on relevancy. I also covered the issue of meta tags above in the meta tag section earlier in this e-book.
Yahoo! believes that a hybrid of human review and mathematics works better than just math alone. Sites included in the Yahoo! Directory or in the Yahoo! Search Submit program are given an editorial review. Yahoo! also has their editors review portions of the web. It is believed that sites that receive a review may be given a ranking boost. Yahoo! grants 501(c) tax-exempt organizations and many educational websites free inclusion into the free side of their Content Acquisition Program.
Not many people knows this but it is a fact that the Yahoo! Search index is also used by AltaVista and AllTheWeb. Even though AltaVista and AllTheWeb feeds from the Yahoo! Search Index, they still use their own algorithm to organize and filter search results. Also, Yahoo! even sometimes uses AllTheWeb and AltaVista as a testing ground to test new algorithms.
The Yahoo! Directory and Yahoo! Search are two entirely separate things. The directory is a manually reviewed collection of websites. Yahoo! Search is powered through various search technologies purchased by Yahoo!
Yahoo! Search probably serves over 100 million searches each day. The directory would likely be lucky to serve more than a million searches a day.
Yahoo! Search is powered through a rewrite and combination of different pieces of what was once AltaVista, AllTheWeb, and Inktomi.
Backlinks is another way of saying "links into a page". When you check backlinks in Yahoo!, ('linkdomain:www.whateversite.com'), it shows most of the known links into a site. Yahoo! has also had some trouble with 301 redirects and may show the wrong URL locations for some of the backlinks.
You can check the backlinks into your home page specifically by specifying the full URL of the home page ("link:http://www.whateversite.com/").
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