From a press release
Today, the open-access publisher the Public Library of Science (PLoS; www.plos.org), announces the release of an expanded set of article-level metrics on its scientific and medical journal articles (some 14,000 articles across 7 titles). The article-level metrics program was launched in March 2009, and with todayâ€™s addition of online usage data, PLoS is transparently providing an unprecedented set of information on every published article. Such information will be of value to researchers, readers, funders, administrators and anyone interested in the evaluation of scientific research.
The PLoS article metrics include the new online usage data (HTML page views, PDF downloads and XML downloads) that are compliant with the industry standard, COUNTER 3.0 http://www.projectcounter.org/code_practice.html, as well as citation counts, comments, ratings, social bookmarks and blog coverage. Usage data will be updated daily and currently include more than four years of statistics from all seven peer-reviewed PLoS journals. With this growing and detailed set of metrics on every article, PLoS aims to demonstrate that individual articles can be judged on their own merits rather than on the basis of the journal in which they are published.
That is a major progress to overcome the shortcomings of ISI’s impact factor (unfortunately, I can not open the provided excel file..)