Speaking of Rky, I have more.

Updates:
I used a NOT gate so now the bottom switch must be the same as the top switch in all cases. This will make learning the code easier. Additionally, there is now actually a door and a third set of switches.
Rinse, repeat, rinse, repeat and we could have a full 10-lever combo with this method.
i hope he understands that no matter what bullstuff security design he thinks of, we can easily hack through it with our pickaxes, TNT, and other stuff.
Hopefully Notch will add something we can do about that, such as stronger walls or something.
Otherwise we'll just surround everything with a pool of lava and armed guards. Remember that we have TNT as well.
didn't I go over this before
I'm going to have my own stuff, herpderp, i'm just saying that he shouldn't expect to be able to repel an entire loving army with some stuffty series of wires and levers that can easily be COMPLETELY destroyed just with one step.
Note: destroying the wires locks the doors.