My site launched 5/1/10. The first 3 weeks I got great rankings and Yahoo was indexing and ranking all of my pages appropriately. I paid for the Yahoo directory and since then, yahoo is only ranking my home page. And the rankings have dropped considerably. In webmaster tools all pages are indexed. Why would this have happened? Also, if i type the name of my site and the exact title of an internal page, it does not show up anymore.