I would like to propose an enhancement such that confluence installations can act as 'sister wikis' to each other. I believe some other wiki implementations can already do this (eg. http://tavi.sourceforge.net/Sisterwiki) This would give the following features:

• Search in one confluence can return the search results which include matching data from a second conflence installation
• A simple way to link to pages in a sister wiki, e.g. [sister:space:page]
• Dashboard shows spaces in sister wiki.

It would be nice to be able to have multiple sister wikis.

In particular, I would like all of my clients Confluence installations to have the confluence.atlassian.com site as a sister wiki, especially so they can access the user guide easily.