Honeypot Toolkit

This plugin allows you to automatically insert your Project Honeypot links into all of your pages and block IP addresses that are listed on the Http:BL list from Project Honeypot. There is an option to block IP addresses that have been blocked by Spamcop using their blacklist and the SANS Internet Storm Center API as well.
To prevent bots from using brute force attacks and scanning your site there is an option to block users that fail to login a set number of times or use blocked user names. You can also block IP addresses that generate a large number of 404 errors. This plugin will also prevent WordPress User Enumeration and automatically block anyone attempting it.