To add to goldengopher's answer above:
http://www.findlaw.com/casecode/supreme.html has a searchable database of the Supreme Court decisions since 1893. Browsable by year and U.S. Reports volume number, and searchable by citation, case title and full text. These blue tabs show types of searches available: "Citation search --Party Name Search--and Full-Text Search.
Related sources :
You can also : Browse by recent decisions, or by calendar year (Dec. 2005 to current year up to Dec. are shown in particular).
http://company.findlaw.com/contacts.html has their contact info for the USA, UK, and Spain.