John R. Lott, Jr. wrote a book debunking a lot of gun myths. He draws on data from CDC, FBI, local law enforcement, etc. A bit dry but it is filled with hard data.
Amazon.com: More Guns, Less Crime: Understanding...
He has another book called The Bias Against Guns. (Half Price Books may be a good source for these two.)
Amazon.com: The Bias Against Guns: Why Almost...
The NRA has a monthly column called The Armed Citizen that gathers news clips from across the nation on normal citizens that have used guns in self defense.
NRA-ILA ::
It also has a search function that may be useful.
Good luck.