If you want to live in a “digital city,” you might want to start looking to the Rocky Mountains or south of the Mason-Dixon line. Florida. Arizona. Colorado. Southern California. To some of us, these might sound like vacation destinations or Sun Belt retiree getaways. But according to the Folsom, Calif.-based Center for Digital Government’s 2006 “Digital Cities Rankings,” these regions are home to some of the most technologically astute municipal governments in the country.