Lol ok... yea ive been wanting floodgates but no one has ever made a working smp floodgate plugin. I want to post this early on so it will get done before the full release of bukkit...
Sorry for not fully describing.... but anyways. I would like to be able to control water. I.e autofarming. setting up a wheat farm then opening up a floodgate to fill the area to harvest. or Boat Locks. being able to raise and lower boats up a stream using floodgate locks....
Working on it. This is what you can do with it, chernobyl: http://www.youtube.com/watch?v=JAPbubXUv2s (Predates all bridge and flood gate mods in SP, by the way. )