[As per the HTML5 spec](http://www.whatwg.org/specs/web-apps/current-work/multipage/...) new values are proprosed in the microformats wiki:

http://microformats.org/wiki/existing-rel-values#HTML5_link_...

You'll note that ``prerender`` is there as well as the ``subresource`` link relation which is a stronger form of ``prefetch`` stating that the resource will be used by the current page rather than likely to be used on subsequent pages. I did some benchmarks to compare the performance of each variation across the top three browsers:

http://chris.improbable.org/experiments/browser/prefetch-tim...