The first I learned about on the Theology Gaming Podcast (woohoo Zachary and friends!!), it's called videogamesandthebible.com . I don't know if I can bring myself to link to them through the CGC portal, since they promote the view that the King James Bible is inerrant, but they've done a great job of highlighting some Christian game developers I may have never heard of.
The other site I "discovered" (and then realized we already link to them) is christiandevs.com. (Free games, woohoo!)
Anyone else know of some devs or resources that are worth checking out?