Content across all multisite blogs

I must just start by saying this is by far the best support forum i’ve ever used. All my questions are always answered within hours, so thanks people.

My multisite install is taking shape and i’ve found some really cool plugins. My question is now this.

I want a user to go in and build their own site, and i’ve kind of done this part. I was two side menus, the left being content they create, specific pages detailing their business, but the right hand column i want to be able to provide pre written content that is featured in every blog. For example, a news page for the industry we’re in that i, as super admin, update and the posts are displayed on every blog. Our a glossary of information, oe a set of generic links.

Any pointers as to how best manage this (if i’ve explained it well enough) would be gratefully received. There always seems to be a plugin to do these things but i’ve searched for a sitewide content plugin and no luck yet.

Thanks in advance