Profiles Free, I'll admit, was something made purely out of curiosity. I wanted to see whether I could build a site that Google would like enough to keep users coming back to while at the same time generating a small stream of income, and it does just that.
The site incorporates Google AdSense and affiliate marketing ads in a very "in your face" kind of style.
One of the best things about this site is that it's almost maintenance-free. I check on it about once a month just to make sure it's still there and functioning.