John Scalzi has an ongoing series on his blog titled 'The Big Idea". It provides an outlet for writers and editors to give a bit more background / inspiration on their latest work than they are normally provided.
The latest Big Idea is editor and anthologist John Joseph Adams talking about Federations.
I've got a copy of Federations with me right now and the table of contents is a combination of giants of the genre and some newer names who just might be the giants of tomorrow. This should be another excellent anthology from JJA.