Syndicating content to other blogs within a WPMU

Hi guys,
I've a question about syndicating content with a WPMU site. Let's say I have 100 blogs running on my WPMU and I need content from one blog (maybe the primary site) published on all these blogs.

I know I can use Autoblog to pull this content in but it will replicate the posts 100 times over in the database (right?). It will work but won't be very efficient.

Is there another option whereby I could query the DB tables of the primary blog to get these posts and display them on the 100 blogs? It would be great if you could point me in the right direction.

cheers,
Fiona