Had this vid on my HD a while. Though lets upload our old legacy project full of weird bugs :) filmed in MC 1.2.3 but the bugs are still there.

The entire sea was filled with gravel and dug out again :) its a 100x100 cube.

On our vanilla survival server.
Our current mobtower: www.youtube.com/watch?v=obP1zgQA7Ew
There is also a piston based mobtower under construction but due to low priority it is still not finished.

With all the changes over the updates, this mobtower is no longer functional. It was the 2nd mob tower on our server made during the beta.
This trap used to drop loads of mobs in the beta :). But the AI changes and bugs in this tower have made this tower obsolete.

bugs:

- 2 villagers somehow ended up in the air here :)

- And I somehow feel this area is bit unstable on our server since the game crashed 2x during this movie :)

- You can see that the sun is clearly shining in the middle of the trap, even tho we have a complete closed up roof.
I think this happened when they lowered the world height from 128 to 127 in the beta, and now they upped it to 255. Our roof has always been on 128 even in the time you could no longer build there :)

- Notice the zombies even burning inside the mobtower in the dark :)