Hacked, remote-controlled home computers, known as robots or "bots," and large groups of robot networks like the one 0x80 runs — called "botnets" — are the souped-up cyber engines driving nearly all criminal commerce on the Internet. Botnets are used to relay millions of pieces of junk e-mail, or spam, touting everything from cheap Viagra to get-rich-quick business schemes. And the botmasters who control these computer networks are at the heart of ominous and increasingly common online shakedowns known as "denial of service attacks." In such an attack, Web gangsters demand tens of thousands of dollars in protection money from businesses. If the businesses refuse to pay, the criminals order the thousands of computers that make up their botnets to flood the Web sites with meaningless traffic, crippling the businesses and costing them thousands or hundreds of thousands of dollars in lost revenue. §
Its long and I skimmed through fast from around the middle; nevertheless, its a must read.