MunyBlock - Block players from doing unwanted things:
Version: v0.6

This is my first public plugin that I'm releasing, but certainly not my first plugin. MunyBlock was originally made for a friend of mines' server (mc.awesomecraft.info) to help combat against griefers and spammers by disallowing players to chat within the spawn radius, and to disallow players to drop items from their inventory which players could misuse and flood the server with item entities. To install, simply place MunyBlock.jar into your plugins directory, reload/start the server, make changes to your configuration file, then reload/restart the server.

Features:

Blocks players from chatting within the spawn radius (configurable)
Blocks players from dropping items from their inventory (configurable, multi-world)
Blocks players from sending links in the chat (configurable)
Blocks players from crafting items (configurable)
Blocks players from sending IP addresses in the chat (configurable)
Blocks players from reloading the server (configurable)

Logs when a player is blocked from chatting within the spawn radius (configurable)
Logs when a player is blocked from trying to drop items from their inventory (configurable)
Logs when a player is blocked from trying to send a link in the chat (configurable)
Logs when a player is blocked from trying to craft an item (configurable)
Logs when a player is blocked from trying to send an IP address in the chat (configurable)
Logs when a player is blocked from trying to reload the server (configurable)

Changelog:

Version 0.6

Ability to block reloading the server was added

Version 0.5

Ability to block IP addresses from chat was added

Version 0.4

Added multi-world support for blocking item drops

Version 0.3

Ability to block item crafting was added

Version 0.2

Ability to block links in chat was added

Version 0.1

MunyBlock was released!

TODO:

Add permissions support