Bukkit

ProtectionStones 1.9c

Minor (or is that miner :) ) update, pushed the Block Placement Event to the Highest Priority Level, with a cancel check to help with interactions with other plugins, tested against Towny so far and works correctly. If you try to place the PS in someone else's town then there is a delay in Minecraft to see your returned PS in your inventory, but it is there, and the placement is blocked by Towny.

The only draw back is placing a PS Region that over-laps a Town, this still isn't prevented, but the player would be blocked from building (etc.) there by Towny.

Compiled for Bukkit 1.6.2 (Dev Build)

Incompatible with PreciousStones, they both act on the same kind of ore blocks and both have the same command name of "/ps".