Information about these cases can be found here. All US Supreme Court decisions can be accessed here starting with decisions made in 1990. The site maintains a 600 case database on historical cases that occurred before that date. The Court's schedule, operating procedures, and legal terms are covered here. The Court maintains this website where one can learn about the Court and how it operates.
Some opinions are also available here.
It also provides articles on charity disclosure rules and other legal issues affecting nonprofits. Note that Form 990 is used by independent, lay-board operated Christian schools. Church owned and operated schools do not use this form.