Where can you find how Justices voted on Supreme Court cases?

There are two Excellent sources for locating the US Supreme Court's opinions and decisions. Justia Beta has a searchable database of all cases, by year or by volume, from 1791 to the present. The Supreme Court maintains updated records on slip opinions for the current Term that may be too new for Justia's database.

Other sites, such as FindLaw and Oyez are also Excellent resources, but I prefer Justia because they have logged the concurring and dissenting opinions for most cases, along with the Court decision, which helps the reader understand both sides of a case.

Despite criticism often directed at it, Wikipedia is also a good site for information on cases from the Supreme Court. The articles for most cases are quite detailed, and include the details of the case, background, decision and opinions of the Court, related cases, and several other areas of importance.