Here is an other survey of current archive usage. (It would be especially interesting to track changes in time these days, to estimate the rate at which progress is occurring.)
Ibironke Lawal, Scholarly Communication: The Use and Non-Use of E-Print Archives for the Dissemination of Scientific Information http://www.istl.org/02-fall/article3.html Issues in Science and Technology Librarianship (Fall 2002)
