ADDED: From WaPo's Robert Barnes:
For years, legal scholars, historians and grammarians have debated the meaning of the amendment because of its enigmatic wording and odd punctuation:
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Gun rights proponents say the words guarantee the right of an individual to possess firearms. Gun-control supporters say it conveys only a civic or "collective" right to own guns as part of service in an organized military organization....
The court rewrote the question to say it would decide whether the relevant provisions of the city's law "violate the Second Amendment rights of individuals who are not affiliated with any state-regulated militia, but who wish to keep handguns and other firearms for private use in their homes."