I think I have heard of this being done on a small scale, but why doesn’t the good hacker community, the ‘white hat hackers’, write anti spam-bots that will go out and clean up all the hi-jacked systems that are sending out spam because some little virus told them too. Distribute the good viruses the same way bad ones are done and you should reach most of the infected boxes in a hurry. And the good bots could close all the trap doors and do stuff to prevent a PC from being re-infected, inoculate them.
And just to make sure the user knows, after all the clean-up is done, a little message pops up to tell the prat what was done to help them out.
I’ll bet the white hats could stay ahead of the black hats, easily. Wish I was a hacker…