I've enabled a few new features on the server today, including:
Wooden Boats:
They are 'uncrashable' and are not destroyed when they bump into things.
They return to your inventory when you dismount them.
They can no longer be placed on land.
Redstone:
Right-clicking a placed piece of redstone with another piece of redstone will act as an Ammeter and tell you the strength of the redstone signal (1-15) to help you work out when a repeater is needed etc.
Glowstone:
Right-clicking any block with a piece of glowstone dust will tell you the light level of the block (1-15), green means safe, red means the light level is low enough for mobs to spawn.
More awesome features coming soon!