Last December I decided to produce the final installment of the Biblioblog Rankings for the year 2009 (Top50Biblioblogs decided to discontinue the project in November in lieu of posting the rankings bi-annually, a project I assume that has been scrapped). A few biblioblogs are hosted by sites which do not allow for individual rankings, at least not by the Alexa ranking site. Unfortunately, these will be listed as No Data, and potentially expunged from the ranking list (a suggestion by John Loftus, and one I echoed). However, there are some blogs that may be labeled No Data because Alexa’s robot is not being allowed to crawl the blog. It might be worth visiting this link and giving Alexa’s robot permission to crawl your site, particularly if you are one whose ranking appeared as No Data (HT: Joel Watts).