Single/Multiplayer changes
 

There are some differences between the single and multiplayer experience currently in Minecraft. So I was thinking I should make a list of what differs between the two versions. Feel free to reply with additional changes that I'm not aware of.

Building, removing, placing blocks - works as it should
Farming - works as it should
Damage - no damage to you or mobs
Water/lava buckets - doesn't work (ask admin for water/lava)
Doors - doesn't work reliably (doesn't stay closed or open and opens half way)
Dropping tools - won't keep their wear status (recharge when you pick them up again)
Redstone circuits - ?
Track and minecarts - ?