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We haven't done anything to think of that would cause this. However, there have been other sites out there who are copying our content for their own sites. Could this cause us to completely disappear? Duplicate content
[edited by: martinibuster at 6:33 am (utc) on Mar. 21, 2006]
[edit reason] Removed URLs and Specifics. [/edit]
Some of my sites were/are experiencing roller-coaster events in Yahoo during the past several months. At some period, the sites just disappear without reason and only to reappear some weeks later and I didn't do anything. There are also chances that you may come back later, but your chance would become zero if it is penalized (you can check it by doing site search and only homepage appears).
So my advice, review Yahoo's guidelines for what is not acceptable for sites, and do a very thorough investigation on your pages. If you find any potential problems, fix them. Then review your site again. Once you are convinced it is all clean, submit a request for re-review to Yahoo. It may take some persistence, but they will review your situation. Be sure to explain (truthfully) what you found wrong with your site and how you fixed it. They can be sympathetic for folks who made honest mistakes.
Good luck!
One more thing you have to take care is to update your content, yahoo does not like a doamin having the same content for many years.