The March 2013 Top 10 list is now available on the DataCite Blog.
It also includes this info about the list:
It is worth mentioning one reason that again most of the top 10 come from figshare. Whereas data published in classical data repositories is usually accessed directly through a search at the data center without using the DOI resolution, publishing the DOI name is the ideal advertising for any figshare content, thus increasing the resolution counts. That is one reason, why figshare DOI names seem to be so popular.
Direct to Complete Post/Top 10
Direct to Figshare