Felons and Guns
The Constitution recognizes the need to deprive people of their liberties under certain circumstances, but says the government MUST follow due process to curtail a citizen's liberties. The government has a well established due process to declare a person a felon and deny them the right to guns and to vote (as well as incarcerate & fine, & all that jazz). In the same fashion there is a process to petition to have those rights restored.
In short, the Heller ruling will not affect laws prohibiting felons from owning guns; the gun-grabbers are hyping the cases in order to scare people.