An interesting and well done illustration related to the concept of BOTNETs and the associated dangers when infected.
McAfee – How my PC became a ZOMBIE
QUOTE: Even folks in the security industry–have a hard time explaining botnets (robot networks of infected computers) in a way that your Uncle Joe or Aunt Betty can understand. Is it really a big deal? Yes, it is. With the rapid growth in malware and bot infections we’re seeing, it’s important for everyone to get up to speed on this threat vector. So we got colorful and created an “infographic” that, we hope, nails the botnet lifecycle and economics just right–not too technical, not too simple.
McAfee – Full sized version of Botnets illustrated