Google Scholar now includes US Federal district, tax and bankruptcy, US State Appellate and Supreme Court cases. From the Google Scholar site:
Currently, Google Scholar allows you to search and read opinions for US
state appellate and supreme court cases since 1950, US federal district,
appellate, tax and bankruptcy courts since 1923 and US Supreme Court
cases since 1791 (please check back periodically for updates to
coverage information). In addition, it includes citations for cases
cited by indexed opinions or journal articles which allows you to find
influential cases (usually older or international) which are not yet
online or publicly available.
Posted by Jon Lutz