Integrated Search

Use an external search engine such as ht://dig to index the family of Ubuntu sites and provide a unified search. A "web service" feature can access the central search database and show the results in whatever website the search was made in. But also keep in mind that people may be searching in a site specifically to limit results to that site. See the problem of high s/n ration when searching wiki.u.c for help content: https://wiki.ubuntu.com/BetterWikiDocs