A free, distributed, open-source project to help website administrators track, stop, and prosecute spam harvesters stealing email addresses from their sites. http://www.projecthoneypot.org/
Small daemon that creates virtual hosts on a network (honeypot). Can be used as a virtual honeynet, for network monitoring, or as a spam trap. For *BSD, GNU/Linux, and Solaris. http://www.citi.umich.edu/u/provos/honeyd/
This two-part paper discusses how hackers discover, interact with, and sometimes disable honeypots at the system level and the application layer. http://www.securityfocus.com/infocus/1826
Information covering intrusion detection and prevention systems, research and production honeypots, and incident handling. Also provides general overview of network security issues. http://www.honeypots.net/
A Darknet is a portion of routed, allocated IP space in which no active services or servers seemingly reside. However, there is in fact include at least one server for real-time analysis or post-event network forensics. http://www.cymru.com/Darknet/
Paper on the use of honeynets to learn more about botnets. Covers uses of botnets, how they work and how to track them. http://www.honeynet.org/papers/bots/