Wow. There are some pretty crazy ideas in this thread, sad that majority of them are either illegal, will get you killed or even land you behind bars. However, all those listed that are the above that are illegal & dangerous are indeed ways to earn "easy money" as the topic reads suggestions for.
I on the other hand tend to work for a living & for my money... however, these are trying times that we're all in these days with a failing economy & loss of jobs everywhere we look. Therefore, I have also myself gone the route of selling my unwanted or unused items on craigslist.org I find that is the easiest way for me to make a few extra bucks & keep from doing anything illegal. I recently sold my old Pool Table on there for $100. I got a call for it only minutes after posting the ad. You would be surprised what people buy off of there. Something you may see a useless or no use to you is something someone else could be searching for & willing to pay to have.
Try it out, what could it hurt. After all, if you're really strapped for cash you could always sell your computer... no, seriously though, check it out... all jokes aside! I don't want to see you out there on the street corner slanging dope or selling your ass. I know too many people who do that for real, it's no way to live.