Drupal 7 Honeypot Module

CodeKarate put up a video tutorial of using the honeypot module:

In this tutorial you will learn about the Honeypot module. The Honeypot modules is a SPAM prevention module that uses a hidden form field to catch SPAM bots from posting onto your site. This tutorial shows you how to configure the module to work on various forms on your site.

This module is indeed very useful to quickly stop certain spam, so you continue with more relevant work.