A couple of months ago I read an article in a magazine, I think it was Wired, about Bitcoins. It is a legitimate Internet money system that can be easy transferred into your money of choice. The way that you gain Bitcoins though is unlike any other way. This will probably be a crappy description since I don't get the full idea of it but lets give it a shot. You get Bitcoins by committing your CPU or preferably your GPU to "mining" which is constantly figuring out mathematical equations until you discover a "block" which will give you 50 Bitcoins (BTC). On average it would take someone as of now two years to get a block, so people have come together and created "pools" which are groups of people who each get smaller, easier mathematical equations and when a block is found, everyone gets a fair share of the Bitcoins. My desktop currently has 2 fairly powerful GPUs and one of them isn't used much so for the past two days I have committed that second GPU to mining Bitcoins in a pool called Slush's Pool. Since it is a GPU that I do not use, I can go about my daily videogaming and internet surfing without problems. As of writing this I have made a whopping confirmed amount of 0.01033337 BTC which is equal to about a nickel. Not much, I know, but if I had more powerful GPUs and more computers to commit to mining, than I would be making a lot more Bitcoins. I'm not sure if I'll continue with mining since I have really just been experimenting with how it works, but we'll see.
To get a better description of Bitcoins and mining than you're probably better off just googling Bitcoins.