I started on an advertising network a few months ago and have nearly completed it, just working on the web directory. I have linked 4 classifieds websites to a chat room and Adsense revenue sharing forum. Also I have used pixel advertising and iframes to show adverts on all 4 sites, chat room and forum! Take a look first at the forum and then follow the links to the other sites built around this. I think I have made the forum more of the central point and the directory should fit next to it along with the chat room and pixel ads. The four classifieds sites are based around the forum. So entry point is always better through the classifieds sites. I would like to see how you navigate from the forum to the rest of the network. http://www.forum.postfreeads.net/ Let me know what you think Cheers Simon.
Directory is still a work in progress. I wanted to keep the forum as normal as possible so that users would be familiar with it.