Among five individuals added this week to the FBI's list of most wanted cybercriminals is a former San Diego college student who developed an $89 program dubbed "Loverspy" and "Email PI." Sold online from his apartment, the program was advertised as a way to catch a cheating lover by sending the person an electronic greeting card that, if opened, would install malicious software that captured emails and instant messages, or even spy on the person through their webcam. The case of Carlos Enrique Perez-Melara, 33, is noteworthy because he appears to have made relatively little money on the scheme, unlike others on the FBI list accused of bilking millions of dollars from businesses and Internet users worldwide. According to his indictment, Perez-Melara sold the program to 1,000 customers, who then tried to infect roughly 2,000 others. Years later, there is an established commercial market for snooping software that domestic violence advocates warn can also be used to stalk victims.