I've just discovered Scirus, a search engine that indexes only science-related content, especially that contained in peer-reviewed publications.
The front page and basic-search are Google-like in their simplicity, but the advanced search is where the engine shines, giving you pulldown menu-powered Boolean operators and search narrowing by information type, file format, content source and subject area.
But why should we really use it? Because, "if you search on Dolly, Google finds Dolly Parton, Scirus finds the cloned sheep."
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