Oh, I made it off the site I launched yesterday. I didn't want to shamelessly plug my own site, so I'll do it without a link: ezsmiley.com
I created an AJAX smiley generator. I've seen AJAX image generators, and smiley generators, but I think mine is the first AJAX smiley generator.
All I did was put up an adsense block on the front page, and sidebars and footers on the gallery pages. Then I submitted it to a bunch of directories and submitted a Digg story, and put it in my sig on a forum. It made it to 3 news sites; CSS Drive, a French site, and a Chinese site. 250ish uniques so far.
So, this is totally whitehat, trying to keep it legit. But that doesn't mean I can't learn stuff from you guys, especially for other sites I make.