Informative rundowns on roughly 250 electronic data services available to users of personal computers and terminals. A knowledgeable freelancer who reports on the EDP/telecommunications field, Ferrarini concentrates on popularly priced services that, in her frequently tart opinion, respond to human needs, i.e., mainly those having to do with banking, careers, education, investment, money management, news, other people, research, shopping, sports, and travel. Covered as well are bulletin boards, electronic mail, and non-network services that cater to local markets. Each entry provides ad-rem commentary on a service's costs, access idiosyncracies, and strengths or weaknesses, plus savvy tips on saving time and money when using it. The text includes an easy-to-follow primer on requisite hardware and communications software. Ferrarini also offers cogent briefings on major suppliers, together with critiques of their equipment and programming packages. As is the case with the service register, her listings come complete with addresses and telephone numbers. For PC owners, Ferrarini's authoritative catalog-cum-directory has considerable appeal as a ready reference to the steadily widening world of electronic information sources and data bases; it could also prove a real eye-opener for those who have yet to join the computer revolution.