Mod name : PlasticCraft
Dependencies : Modloader, ModloaderMP, Minecraft Forge API
I installed mod manually on the server and it works like a charm.
Tested on : Craftbukkit 1.1-R4 and Craftbukkit 1.1-R3
There is a Craftbukkit version on Bukkit ports, please intergrate on it on next release, It's a fun mod, and you can make condoms* on it
*I lied you can't make condoms >.<