I mentioned Sympoze ('Digg for philosophers') previously. You can now integrate the Sympoze 'vote button' right into your blog. (I've done this for individual post pages only, since I don't want my main page to load any slower.) Hopefully this will encourage more philosophers to make use of the service, which will in turn make it all the more valuable as a filter for philosophically interesting online content.
So: if you haven't done so already, join Sympoze, vote up blog posts you like, and see what other philosophers have recommended.