John Scalzi has made his novella, The Sagan Diary, available for audio download at his website - for free! This story covers the period of time between The Ghost Brigades and The Last Colony. You can get the print version from Subterranean and Amazon.
Each chapter is read by a different author-friend of Scalzi's. Readers are Elizabeth Bear, Mary Robinette Kowal, Ellen Kushner, Karen Meisner, Cherie Priest and Helen Smith. Take advantage of this deal if you are interested in Scalzi's writing at all - as a fan or potential fan.