How to destroy a botnet

Botnets are, without any shadow of a doubt, one of the biggest scourges of IT security today. From sending spam to launching DDoS attacks and distributing malware, botnets can be found at the centre of most of the security problems facing computer users right now. So wouldn't it be fun if you could take down, knock over and destroy a botnet? The good news is that it seems you can, with a little determination and a lot of inside knowledge.