Intute

Intute is a new FREE online service provided by universities in the United Kingdom.
the URL: http://www.intute.ac.uk/
From its website: "Intute is a free online service providing you with access to the very best Web resources for education and research. The service is created by a network of UK universities and partners. Subject specialists select and evaluate the websites in our database and write high quality descriptions of the resources...Our mission is simple - Intute exists to advance education and research by promoting the best of the Web in one easily accessible place, providing access to quality resources through a process of evaluation and collaboration...Automation can't replace our human value judgments, nor can it be responsive and dynamic to meet the real needs of UK HE and FE - but Intute can. By interacting with the UK HE and FE communities we can evolve and develop the service and its resources in line with changing requirements..."

While the sources suggested come from the European/British perspective, this may be worth a try!