I have a site that, like about.com, has sub-domains that deal with unique subjects. When I originally set-up my site years ago I installed wordpress in each sub-domain. For the main page of the domain I had another installation and a static page linking to all of the sub-domains. I now would like for the main page to rotate the content form the sub-domains. The only way that I could think to achieve this would be for the whole site to be under one installation. In order to maintain my sub-domains, however, I would think that I would have to install WordPress MU and that seems like overkill, at this point. Any suggestions as to what I should do?