Solaris is serializing for free the second Celestial Empire novel Three Unbroken by Chris Roberson here, a chapter twice a week with a tentative publishing date in 09:

http://www.solarisbooks.com/books/three-unbroken/free/index.asp

The first novel in the series with a simultaneous time frame with the one above is The Dragon's Nine Sons to be published by Solaris next spring.

Until now there are several interesting short stories in the milieu of the Celestial Empire (I read most and some are available for free online). A complete bibliography and free stories are at the author site here:

http://www.chrisroberson.net/