It’s been a while since I checked in with them. It looks like Project HoneyPot is doing a good job of collecting data about spam, spammers, and the way they collect email addresses.
In brief, the project asks webmasters to embed non-visible links on their websites. These links generate pages with non-visible email addressess. The links and addresses are visible in the source code of the web pages and, thus, to Internet search robots (spiders). Some of the spiders are operated as address harvesters for spammers. When the project receives an email addressed to one of these addresses, it adds the address of the spider and mailer to its database, which is then used to help generate blacklists and other spamfighting tools.
Several CCIM sites participate in the project.