ResourceShelf has put together A Quick Look at a Few Free Science Search Tools. Among the tools and resources it covers are BioMed Central, CiteSeer, DOAJ, Global Science Gateway, Google Scholar, Highwire Press, Microsoft Live Search Academic, National Science Digital Library, OAIster, PubMed Central, Science.gov, Scirus, and Scitopia.
Posted by
Peter Suber at 7/10/2007 03:58:00 PM.
The open access movement:
Putting peer-reviewed scientific and scholarly literature
on the internet. Making it available free of charge and
free of most copyright and licensing restrictions.
Removing the barriers to serious research.
I recommend the OA tracking project (OATP) as the best way to stay on top of new OA developments. You can read the OATP feed on a blog-like web page or subscribe to it by RSS, email, or Twitter. You can also help build the feed by tagging new developments you encounter.