I've created a multiplayer version of the well known Skyblock Survival map. Here are some pictures of it.
A birds eye view of the map:
When you spawn:
What is inside the chest:
The compasses are used to get back to your island when you die (requires Bukkit servers)
A view from one of the islands (before bridge collapse):
And finally, when having fun playing:
I hope you'll have fun playing on this map with your friends, and I wish you the best of luck!