As for how I carry, well, when I worked for an Israeli company I carried with an empty chamber because that is the standard safety protocol taught in the Israeli armed forces, and everyone at work understood it.
When carrying around town I follow the advice I read from Massad Ayoob's writings, where he recommeded not carrying a double-action pistol cocked because prosecutors have been known to use that fact against citizens who defend themselves with pistols. He recommended carrying double-action pistols with a cartridge in the chamber, hammer down, and on Safe it your pistol will do that with the hammer down (CZ's don't), and to use the trigger to cock the pistol on the first shot as evidence of your lack of premeditation to shoot someone. Another plus is that the longer, heavier double-action trigger pull is slightly less likely to result in a negligent discharge (something I definitely don't want to do, as I stated in another thread). It seemed reasonable to me.
I do own one single-action auto (my little Beretta Jetfire 950) and I do carry that cocked and locked... when I carry it at all, which isn't very often.
Scott