To summarize, the project catches spammers by putting fake e-mail addresses on special pages that only harvesters crawling websites should ever find. When one of those addresses get spam, they've caught a harvester and know exactly when and from what IP the e-mail address was harvested.
It only just recently occurred to me that there really is no good WordPress plugin that allows you to hide honey pot links in your website. So I wrote one.
I was surprised at how easy it was actually. I hope it's helpful to someone, somewhere.