(Found out about this through Shoemoney)
Well free as in no money changes hands ever. It's a brand new service called Blogrush. It's basically an automated link exchange served javascript style similar to AdSense. The only thing that guarantees you clicks are catchy titles.
Yes this link does have my referral code...but all that does is get me more credits for more traffic. I don't make shit. I don't usually spam GFY with crap but I thought this was pretty cool.
http://www.blogrush.com/r64511308
Check it out.