Suggestions for finding related blogs

I am trying to think how to display related blogs in my Ajax Tagger 2.0 and in the resulting HTML that comes from the selection made in the application. It is one of the remaining parts of the application that are still todo.

Does Anybody have any ideas?

I am also trying to find a good search engine that will give me a list of related blogs and associated feeds. So far I have Technorati and Google, Does anybody know of any other good ones?

Email me or leave a comment :)