There's an interview with designer Chris Thomasson up on the Wizard's site, and it concerns Complete Champion. Chris dispels a few of the rumors about the book, and talks about what it is and what it is not.
When asked about the prestige classes offered in the book, specifically as to his favorite, he responds:
"My favorite group is probably Pelor's Shadow Guard, and the shadowspy and shadowstriker prestige classes tied to it. The idea of the god of the sun having, basically, a secret service really makes me happy. This group just really does things to the interaction between the churches of Pelor and Heironeous that makes them more real for me. This group is going in my next campaign."
Thanks for the compliments, Chris! Those PrCs, as well as the organization they serve, were part of my writing assignment on Complete Champion. Granted, I don't know how much revision they saw during the editing and development processes, but I figure I'll know for sure in a very short while (as soon as my comps arrive). I guess I'll also find out if I made the cover of the book or not (see this post for details on that topic).