Suggestion: OpenSearch XML on documentation website
Firefox (and I assume other browsers) allow websites to advertise site specific search to be added to the search bar. This involves adding an OpenSearch XML to the website (http://www.opensearch.org/Specifications/OpenSearch/1.1#OpenSearch_description_document).
I think it would be a useful feature if the online documentation had this option. Obviously I can use site:cmake.org at the moment so not high priority at all.
EDITED: for spelling