I am noticing an interesting phenomenon with Yahoo and I wanted to see if others are experiencing the same problem. I launched four new sites in early October for four different clients. Although the subject matter of each site was similar, there were no other similarities to the sites (they didn't link to each other, did not share content, etc.).
All four of the sites were submitted to the PositionTech SiteMatch. The sites all did extremely well in Yahoo for relevant searches. I then submitted two of those sites (that already were listed in SiteMatch) to Yahoo Directory. Those two sites were both added. Almost immediately after the sites were added to the directory, their rankings on Yahoo dropped significantly. The other two sites were unaffected.
It is my hypothesis that Yahoo's change to the title/description of the site affects the rankings in the Yahoo. Therefore, any benefit from a directory listing can be outweighed by the negative effect on the changes to the title/description.
Am I crazy? I am strongly considering immediately cancelling one of the Yahoo Directory listings to see if the site again ranks well for relevant keyword phrases once the original title/description are restored.