(Not) Understanding Yahoo SEO

Once again I’m turning to the brilliant minds of the blogosphere for insight into the weird and wonderful world of SEO.

My work site, The Blog Studio, ranks quite well in Google, and fairly well on MSN. But on Yahoo, we barely even register – we’re listed number 73 for the same keywords that rank us #4 on Google.

The research I’ve done seems to indicate that Yahoo’s ranking algorithm is similar to Google’s in that it considers things like titles, h1 tags, etc. I’ve built sites that perform quite well on Yahoo, so am at a loss as to the poor performance of TBS. Anyone have any insight into this?