Most lawyers and law students know that that the U.S. Supreme Court website posts slip opinions of recent cases. What you might not know is that as the Court publications unit finalizes its slip opinions and eventually compiles them into bound volumes of the United States Reports, it also makes the entire contents of individual volumes of the United States Reports available as individual .pdf files. The service begins with Volume 502 (October 1991), and currently goes as far as Volume 538 (through May 27, 2003). This means that you can download entire volumes of the U.S. Reports and save them to your hard drive for subsequent searching and use offline — with the correct pagination, italics, appendices, charts, and graphs — all for free. Really cool, at least if you're into that kind of thing.