Poettering: The Most Awesome, Least-Advertised Fedora 17 Feature

This has been a desired feature in Fedora since 2009, when it was driven by Chris Tyler. All Poettering did was to step in, pick the item from the feature list, and do the actual work required. (Well that was not that little, actually.) Here is the stale feature page from way back:
http://fedoraproject.org/wiki/Features/Multiseat