Gamasutra has posted the in-depth post-mortem on Sins of a Solar Empire.  For gamers as well as developers who want to see how a hit game was made that was done almost completely differently than the typical publisher/developer system, you'll definitely want to check this out.

It also has screenshots of very very early builds of Sins that you'll probably get a kick out of.

View: Sins of a Solar Empire Post-Mortem