Here's a piece from FactCheck.org which debunks the myth that Australian murder rates have gone down since strict gun control laws were put into place. Gun murders, have decreased by half since the laws were first enacted in 1996:
FactCheck.org : Gun Control in Australia
http://www.usmessageboard.com/6673083-post1.html
http://www.usmessageboard.com/6513015-post1.html