I want my site to have a side column which will contain some default content (banners, rss feeds, summary link lists etc.) and I would like to have all this included by default in any pages created but allow creators to modify or replace it with any other content or web parts if they want to.
I've added this default content as a series of web parts in a web part zone in the layout file, and any newly created pages using this layout do indeed get a copy of this content which can be customised, but any changes I subsequently make to the web parts in the layout file are not reflected in any already created pages.
What's the best way of setting things up so that I can make changes at a high level which will be automatically reflected in child pages which include a non-customised copy of it?