I'm currently writing on a very small site where people can post gaming articles using trackback. It's targeted at gamers who have a weblog (that offers a trackback feature).
I've chosen trackback simply because it puts the traffic on the clients bill and requires that people explicitly state that they want their article to get listed on the site.
In the current state this system is more a proof of concept than anything else. But if someone already wants to post on it, feel free to do so :-)