Analytical tool for measuring and comparing the impact/performance of individuals, institutions (i.e. universities), countries, and journals across 22 scientific fields.
Citation database with a social science perspective. Conduct subject, author, and title searches or use article references to find out who cites whom, thus identifying new and more recent articles.
Will help you determine journal "impact factor" and identify the most frequently cited journals in a given field. Useful when planning a publication strategy.