Try it! It's fun!
By far, the favorite site I found was
I guess the world will end tomorrow. I'm not quite sure if it will end at midnight tonight, noon tomorrow, or even whether the end of the world will observe daylight savings time.
At any rate, assuming we're all still here tomorrow, I guess we can all console ourselves with the fact that most of us will be dead by the time the next 6-6-06 rolls around.