I hate to burst your bubble Brando, but if it is email that you are trying to combat, then your approach may backfire.
Most of these companies don't really want to sell you anything. HOWEVER, by responding, they know that your email is legit. At that point, then add your eddress to a list that they guarantee are real email accounts. Then they SELL that list to more spam folks. And the viscous cycle begins.
My $0.02: just delete junk mail - by responding you are now verifying that your email is legit, which opens up a pandora's box.
k911SC: I like your response to the 'snail-mail' version of junk mail. I may try that myself, except I'd remove my name/address from the mail I send back to them. Simple justice!
-Z-man.