I have a blog.. so mysite.com and I have 20 writers that I want to allow to each have their own advertisements in their article. Now when they each sign-up for a adsense account can they all input the same domain (mysite.com) upon registration? ...does it matter what domain you put in upon registration.. because what I'm wanting to do is get them send me their PUBLISHER ID an I will put that in their article... Thanks in advance.
I don't think it is possible. Ask them to sing up for Adsense separately with their own sites then you can get them for your project.
Have you tried using the multi-site feature of Wordpress 3? It's like each writer having their own blog as a sub-domain under your main domain. The Wordpress official site uses this feature to provide free blogsites. Hope this is useful.