I know this plugin exists, but I can't seem to find it. The plugin will teleport a player to a certain specified coordinate in the map if he falls into the void. I've seen a server with this option and they run Bukkit.
leslieliang These two plugins seem to fit your description http://forums.bukkit.org/threads/fix-tp-safevoid-v1-2-2-disable-falling-through-void-1-1-r7.41258/ http://dev.bukkit.org/server-mods/voidwarp/
Thanks, but neither are updated for 1.3.1-R1.0/2.0. I saw one called SkyFall, but falling from into the void will send you to the top of the configured world and kill the player after they complete their fall from their 200 blocks of death.