WorldWideScience.org - the Global Science Gateway

"The U.S. Department of Energy (DOE) and the British Library, along with eight other participating countries, today opened an online global gateway to science information from 15 national portals. The gateway, WorldWideScience.org, gives citizens, researchers and anyone interested in science the capability to search science portals not easily accessible through popular search technology such as that deployed by Google, Yahoo! and many other commercial search engines. [...] Relying on a novel technology called federated search, WorldWideScience.org gives science information consumers a single entry point for searching far-reaching science portals in parallel, with only one query, saving time and effort."

Via ResourceShelf