Webometrics has announced an updated new beta version of the ranking of world repositories. In the latest ranking, the top five repositories in descending order are arXiv, SSRN, RePEc, E-LIS, and Citeseer.
New repositories have been added, like PubMedCentral that was inadvertently missed from the previous edition. Other repositories not focused on research papers have been excluded. Rich files ranking now includes only Adobe Acrobat pdf files, as the numbers involved for other formats are very low for ranking purposes. For the same reason, only data extracted from Google and Yahoo are considered for this indicator.
In addition, Scholar ranking is build now on the mean between the total number of items and those published between 2001 and 2008. This is to increase the weight of the "fresh papers" deposited.