English Reports is a comprehensive database containing almost 125,000 English court decisions from the year 1220 (!) through June 26, 1873. Decisions are organized by year and month. The interface is pretty bare-bones, but there is Boolean searching though I can't vouch for its accuracy. The database comes to us from the Commonwealth Legal Information Institute a nonprofit initiative that provides 571 databases from 59 Commonwealth and common law countries and territories as farflung as Mozambique, Belize, Australia and Samoa.
hat tip: InSite