I literally had never heard of this feature until I found this excellent post by Elie Bou Issa. Turns out that the Calendar Repair Assistant, or CRA, is documented, but I hadn't run across it.
In brief, the CRA's job is to ensure that calendar data items stay consistent across the organizer and attendees' mailboxes. This is a hard job given how many different clients may be in use, and how many of them (I'm looking at you, Apple) have problems handling some kinds of Exchange calendar events. Elie's article explains things quite well, so I have nothing more to add than a delighted fist-pump that this feature even exists.
i tried to leave this comment on the buckeye express vs uverse post but i could not:
how do we get started promoting awareness of google's new project
(google fiber for communities -- 1000 mbps internet access for select areas -- largely to provoke existing ISP's to offer better service: http://www.google.com/appserve/fiberrfi)
anything to compete with buckeye, please. this would change everything...