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In addition to freely available Google Scholar and SPIRES, and subscription-based Web of Science, there is a free NASA Astrophysics Data Systems database which, contrary to its title, appears to have broader scope than SPIRES, at least as far as mathematical physics is concerned; it provides abstracts (but not reviews), citations, and, for many old papers, their full-text scanned versions. Now it is sort of integrated with arXiv.org: when looking at the abstract of any arXiv preprint, you see the link to its citations and references at NASA ADS under References & Citations. This database has, inter alia, a specialized physics and geophysics search engine.