A Wordpress installation (on your own webspace) allows for multiple author sign ins. Now, is there a plug-in so each author, when publishing a blog post, can their own Adsense Publisher ID on the ads? Also, is there a way to split the pageviews so it's something like 40% site admin and 60% author?
I don't know about splitting page views, I can't imagine any point to it, but you can set ad rev on a split of your choosing. Check this out and see if it has what you want: http://wordpress.org/extend/plugins/author-advertising-plugin/