Google Adsense
A new addition to this site is Google Adsense. You simply register on google's website, paste some code into your site, and wait. It's one of the simplest ways I've tried to make money online, since you don't really have to do much work at all.
You choose where you want ads to appear, how you want them to look, and google will do the rest. They pick relevent ads, display them on your site, and you get money when visitors click them.
You can also earn money by promoting various Google programs, such as Picassa.
If you want to sign up and start earning money for your site, click the link below.