The Supreme Court Database now has quite extensive analysis tools on its website. The newly expanded version is still officially in beta mode, but is very functional. The Supreme Court Database is the creation of Prof. Harold Spaeth of the Michigan State University College of Law, with contributions from various other illustrious law and politics scholars.
Among the extensive variables you can study are:
Identification Variables (Case, Docket, U.S. Reporter Citation, Supreme Court Citation, Lawyers Edition Citation , LEXIS Citation )
Background Variables: (Case Name, Petitioner, Petitioner State, Respondent, Respondent State, Manner in which the Court takes Jurisdiction , Administrative Action Preceeding Litigation , Administrative Action Preceeding Litigation State ,Three-Judge District Court , Origin of Case, Origin of Case State , Source of Case, Lower Court Disagreement, Reason for Granting Cert , Lower Court Disposition , Lower Court Disposition Direction, Chronological Variables , Date of Decision , Term of Court, Natural Court, Chief Justice, Date of Oral Argument, Date of Reargument)
Substantive Variables (Issue, Issue Area, Decision Direction, Decision Direction Dissent, Authority for Decision 1, Authority for Decision 2, Legal Provisions Considered by the Court, Legal Provision Supplement, Legal Provision Minor Supplement
Outcome Variables (Decision Type, Declaration of Unconstitutionality, Disposition of Case, Unusual Disposition, Winning Party, Formal Alteration of Precedent, Voting & Opinion Variables, Vote Not Clearly Specified, Majority Opinion Writer, Majority Opinion Assigner, Split Vote, Majority Votes, Minority Votes, Justice ID, Justice Name, The Vote in the Case, Opinion, Direction of the Individual Justice's Votes, Majority and Minority Voting by Justice, First Agreement, Second Agreement).