First story: Bitcoin.
Bitcoin is the transaction tool of an underground economy. The users of this currency work for each other and pay in bit coin. One bitcoin is worth about $US5 according to wikipedia. If you want to know about bitcoin wikipedia is a great start.
I heard of a server being discovered working with bitcoin. I asked what someone would do with a server to generate bitcoin. Here I learned a second term rainbow table. The suggestion was that a technician had compromised a server and was using it to create rainbow tables and being paid in bit coin.