I stopped reading at "Since then my PageRank has dropped."

get rid of that service immediately if that's the case. Its highly likely that google has flagged their links as irrelevant.

You're asking for a simple way to do something potentially very difficult. The search functions you need would require a database and programming well beyond HTML.

If you haven't already...

Every subscription service is going to have slightly different requirements. Your feed looks fine to me but it might be missing an element required by Bloglines. It might be as simple as reading...