A paper published at the New Security Paradigms workshop describing using active defense.
D. Bruschi and E. Rosti, "Disarming Offense to Facilitate Defense," presented at 2000 Workshop on New Security Paradigms, Ballycotton, County Cork, Ireland, 2000.
Bruce Schneier states that the community needs to look increasingly at active defense for protection
Bruce Schneier's attack on active defense in the hands of the RIAA and individuals
A case for the use of active defense in almost any situation
A presentation (in PDF) regarding active defense, its potential, and limitation
Timothy Mullen's online column regarding strike back technology - attached is also a very interesting discussion about the article
Timothy Mullen's electronic essay in defense of active defense as a legitimate security tool
Media article about Tim Mullen's 2002 Defcon presentation about hack-back and active defense.
[Book] Publisher's Comments: Are you tired of feeling vulnerable to the latest security vulnerabilities? Are you fed up with vendors who take too long to release security patches, while criminals waste no time in exploiting those very same holes? Do you want to know who, exactly, is really trying to hack your network? Do you think EVERYONE should be responsible for securing their owns systems so they can't be used to attack yours? Do you think you have the right to defend yourself, your network, and ultimately your business against aggressors and adversaries?