Karl-Friedrich Lenz [1] proposed something similar in his book \”Grenzen des Patentwesens. Konkrete Massnahmen gegen die Patentinflation\” on the level of software patents, while darkonc [2] comes out with the idea of effectively answering back to Spammers.
The question simply is, what would happen, if any spam receiver would answer back to the spam mails or eventually blog spams. Most probably, the spammer its system or organisation would brake down due to the load of requests. But as Lenz argues, it would need a major movement to cause any mattering effects. Samples of handling Nigerian Spams could be read on 419eater.com [3]; via lessig.org [4].
[1] http://k.lenz.name/d/v/index.html
[2] http://www.kuro5hin.org/story/2003/11/4/111059/720
[3] http://419eater.com
[4] http://www.lessig.org/blog/archives/001584.shtml
