(Physics, Computing, Electronics, 1884-present). Covers all aspects of these subjects, in approximately 4,200 journals and 1,000 conferences as well as books, reports and dissertations. (Updated weekly)
Update (5/8/06): Now includes the Inspec Archive. Including over 800,000 records, the backfile covers the literature of physics, electrical engineering, and computing from 1884-1968. Corresponds to the print General Science Abstracts.