There is potential here for good use (Score 2, Interesting)

Think about this: I offer you a free broadband connection on a couple of terms: #1: you must leave your computer on at all times, and #2: You must install and leave installed my special little distributed computing applet. When your machine is idle, it would connect to my servers and become a node in a massive cluster. I could then sell time on this cluster to companies and individuals with needs for extreme processing power. Interesting idea, no?