Scopus, the abstract and citation database of peer-reviewed literature and quality web sources, will incorporate the h-index soon. The h-index considers the publication records of an individual, the number of papers published over n years and the number of citations for each paper. The result is a single number, the h-index. To provide the user with additional clarity Scopus sys it will include visual aids that present a transparent overview of citation and publication patterns over time, revealing whether the h-index is dependent on a few highly cited papers or that the author’s papers have a relatively consistent volume of citations.

See here for a recent Nature Commentary on the h-index; and see here for a 2005 Nature news story “Index aims for fair ranking of scientists”.