http://www.findlaw.com/casecode/ - FindLaw's Cases and Codes section contains resources and links for both state and federal laws. This includes resources pertaining to constitutions, statutes, cases and more. Run a search for case summaries or select a jurisdiction to browse applicable laws.
http://www.law.cornell.edu/ - The Cornell Legal Information Institute offers all opinions of the United States Supreme Court handed down since 1992, together with over 600 earlier decisions selected for their historic importance, over a decade of opinions of the New York Court of Appeals, and the full United States Code.
http://www.justia.com/ - Law and Legal information for lawyers, students, businesses, and the public. Search by legal practice areas and specific cases, among other search criteria.