Have you looked at Calais 2.0 as a data source for your site? It's Reuters venture into the Semantic Web, and its free content complete with tags so you can fil

Have you looked at Calais 2.0 as a data source for your site? It's Reuters venture into the Semantic Web, and its free content complete with tags so you can filter science-related items. (http://www.opencalais.com/ http://www.opencalais.com/)