On a side note I looked at the future plans for the Zeppelin mod and yay!
Quote: SMP!!!!!
Controller block direction determines initial ship direction
Ships consume fuel (configurable)
Crashing the ship at high speed will cause blocks to break
Remote control
Ships created in water (or lava?) will have vertical motion disabled
Configuration file (custom blocklists etc)
Chests/Furnaces/Workbench functionality.
Non-ugly texture for controller
Larger ships are slower to accelerate and turn (configurable?)
More complicated (and expensive) recipe
Be able to place new blocks while ship is in motion (and break blocks)
Momentum
If it ever comes to pass that a client mod is required to play on kiwike I will quit Kiwike. Not because I can't install client mods, I can, but because of the principle of the thing.