Recommended architechture for multiple wordpress installations with a shared database

I'd like to create a several Wordpress websites with a unique relationship between them:

- There will be one main WP site - main.com with several categories for posts.

- There will be several WP sites installed under subdomains: daughter1.main.com , daughter2.main.com

- The daughter sites need to pull posts from several categories (not all of them, and each might pull from different categories) of the main site, but they still need to have independent posts on categories of their own (unique for them).

How would you suggest to approach that?

Please note that the daughter sites will be used as a sub domain of different sites (e.g daughter1.main.com will actually be a开发者_如何学JAVA subdomain of random.com (somedomain.random.com)). But this can probably be done via simple DNS mapping.

Thanks,

Roy

Alright, I believe I solved this by myself. Here is how I'm going to approach this:

1. Setup WP 3.0 with Netword/MultiSite configuration
2. Setup the daughter sites as subdomains (part of the network)
3. Add FeedWordPress plugin to daughter sites
4. Add the RSS feeds of the relevant categories in the FeedWordPress settings
5. Install WordPress MU Domain Mapping on the daughter sites and map the sites properly

I hope others will find this useful.