Statistics on crimes committed by permit holders in Texas and Florida can be found here. (scroll down to "The Experience of States with Licensing Laws.")

The rest of the article also debunks the unfounded fears that licenced gun carriers are the cause of an increase in violence.

As far as the effect on the crime rate, I recommend the Lott/Mustard report, which can be found here.

Others here have pointed to increased crime rates where guns have been rigidly restricted (to honest people.) Washington D.C. has one of the strictest sets of gun laws in the nation. Check out the crime rate.

If you don't feel like plowing through all that statistical crap, try using common sense. Where it is illegal for honest people to carry guns, who is going to be carrying them? And how do you think that will affect the safety of the average citizen?