This “More Recommended Blogs” page on Posterous has been like this for as long as I can remember.
The truth is though, this page isn’t really useful and the small column of blogs on the Subscriptions page under the header “Recommended for me” have always shown me blogs by people that I know, and that I’ve been more prone to subscribe to.
Open Mode 
I wonder what the recommendations are based on? They seem to be recommended only because they’re the most popular blogs. If I blog about design, why not present blogs to do with design and related interests?