I've been playing around with google's new custom search API.
I think that the wordpress community has a great tool here. We could build an engine that helps us find the best themes, plugins, tutorials, etc in one place.
Would you be interested in helping me modify the websites searched so that we have a successful engine, able to find what we need the most? One way of doing this is to give others access to the search filters. Email me if you would like that type of access.
Visit the site and giving it a whirl. I've found that the more specific your search term, the better the results. I think we could really be on to something here.