Yahoo! and Spam
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.
Since it is easy to get de-listed via a manual review, it is suggested that you not use overly aggressive, spammy techniques to achieve top Yahoo! placement unless you can afford to burn the URL. Also, do not submit your site to their paid inclusion program if it does not have original and unique content or if your site may be rejected and removed from their search index.
If your site gets de-indexed from Yahoo! and you think it was due to not following their editorial guidelines, then clean up the spammy stuff and submit your site to the Yahoo! Search Submit Express program. Submitting your site will get it reviewed and re-crawled by Yahoo! Slurp if the editors see your site has been fixed.
If your page was removed and you cannot afford Yahoo! Search Submit Express, read the Yahoo! spam guidelines and request a site review. If that does not work you can email them at ystfeedback@yahoo.com.
Additionally, Yahoo! has a search help page that may help answer some of your questions about their search technology:
http://help.yahoo.com/help/us/ysearch/index.html.
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