Thought I'd share some of my favorite links for dispelling some of the FUD that sometimes pops up with discussion about guns.
http://www.handgunlaw.us/They always link to the state law sites, so you can always get the actual text. Click on a state to see a PDF of summary of state laws.
http://opencarry.org/maps.htmlSort of a meta-site of places like handgunlaw.us, has graphical representation of things like open carry, concealed carry, airport carry, college carry..
http://www.carryconcealed.net/packngoTrip planner for someone intending to travel with their firearm. Lets you know how laws change as you cross state lines.
The next few are all wikipedia, and while not authoritative, they usually provide credible references that can be checked
http://en.wikipedia.org/wiki/National_Firearms_Acthttp://en.wikipedia.org/wiki/Gun_Control_Act_of_1968http://en.wikipedia.org/wiki/Firearm_Owners_Protection_Acthttp://en.wikipedia.org/wiki/Brady_billhttp://en.wikipedia.org/wiki/Federal_assault_weapons_banhttp://en.wikipedia.org/wiki/National_Instant_Criminal_Background_Check_Systemhttp://en.wikipedia.org/wiki/Protection_of_Lawful_Commerce_in_Arms_Act