SupremeMortal/RandomTeleport

Bukkit plugin which lets you teleport players to random locations. This version is for MC 1.2.5 (Tekkit support)

RandomTeleport

Plugin which lets you teleport players to a random location of a map within your provided paramaters.

SpigotMC resource page: http://www.spigotmc.org/resources/fubs-random-teleport.1094/