Minecraft 1.0 release and downgrading to minecraft 1.8.1 client.
Since minecraft 1.0 have just been released, people updating wont be able to join our minecraft server, since it is still running 1.8.1 until a recommended version of craftbukkit have been released, and our plugins have been updated to support minecraft 1.0. So in the mean time people have to wait with updating to 1.0 [...]