Even if you don't have a few free minutes, make time to read Brian Doherty's history of the Heller case. It gives a quick run-down of how the case came to be and the numerous near-misses it had along the way.
Particularly interesting is how the NRA played an obstructionist role in an effort to block Heller in the early stages out of fear that the time wasn't right for a Second Amendment challenge.
Concluding, Doherty says:
An excellent piece.