There are better samples over on Joey’s post. I did up a document (my MBA application letter, yay!) in Constantia tonight and it’s a nice, readable body typeface; goodbye, Times New Roman! Or at least goodbye Georgia. Candara looks like a Verdana replacement, Calibria Arial. Consolas is monospace. I can’t place Corbel. I love all six. I don’t know what’s with the Cs, though.
(Also, here’s how to get the fonts out of the installer if you’re in Linux, at least. I don’t know if the same technique will work on OS X.)