FindLaw: Supreme Court Opinions
Searchable database of all U.S. Supreme Court decisions since 1893. Browsable by year and U.S. Reports volume number, and searchable by citation, case title and full text.
Justia.com: U.S. Supreme Court Cases
Searchable database of all the U.S. Supreme Court cases since volume 1 in 1791. Includes related annotations, blogs, commentary, and web sites.