My friends and I have a pretty fun multiplayer Minecraft world going, complete with a strip mine with an automated transit system and an enormous cobblestone pyramid. Everything is totally sweet...
Except the spawn area. The spawn area seems to have anti-griefing measures or something that prevent us from putting blocks there (or taking blocks out). This is an issue because Creepers have no such restrictions. Dozens of Creepers have gone to town on newly spawned players, blowing holes in the terrain and generally wreaking havoc on the spawn area. It's now covered in sand and water and is pretty much a giant pain to get out of when you respawn.
How can we fix this? Can we turn off the anti-griefing thing? Can we edit the world somehow to fix up the spawn area and make it less like a minefield?