Every now and again a Bukkit question pops up.
In my opinion, these are off topic on this site.
This is supposed to be
Game Development and not
Bukkit plugin development for Minecraft, or is it?
How should questions like this be treated?
Minecraft is a game.
Modding a game is developing new experiences for the users of the game.
Modding is thus game development.
Game development is the core of GameDev.se.
We can conclude that Minecraft/Bukkit modding, and game modding in general, has its place here.
A thing to keep in mind: even if there is not a lot of users that are able to answer questions about game mods (or any very specific domain question), it does not mean that the questions must be considered off topic.
As far as I'm aware, Bukkit plugin development is functionally equivalent to developing mods for Minecraft.
Consequently, I think Bukkit questions are (generally) on-topic here.