LookUp - Better stair and slab placement! Version: Latest - Download Source: Included in the .jar Changelog & more: BukkitDev LookUp changes the way you place upside-down slabs and stairs by checking if the player it looking up or down instead of the vanilla behavior.
Haha, didn't think that out. xD But how would one get approved with a plugin that requires MC 1.2.3, since you have to type the RB in the title? The beta build?