I have earned some money through adsense by placing my adsense ID on ad revenue sharing forums such as kingofdollars.com and forums.digitalpoint.com, but there are more places where you can basically earn with adsense without ever having a website of your own. I found this blog where several adsharing sites are listed, he has some nice articles to read about too.
To get an adsense account you need to register at http://google.adsense.com it will not cost you anything to register. If you do not have your own website like me there is a way to get an adsense account through www.blogger.com/, it takes about 1-2 days for your adsense account to be activated.
Once you have your account activated you can already start placing your ID anywhere you want that is allowed by the adsense TOS, be sure to follow their guidelines and make sure you would not break any of their rules or you will get your account banned, and once your account is banned it is lost forever along with whatever earnings you had with it.
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