Shapechanger feats?

[Bonzai]

I have a concept for an NPC, and could use a re-fresher as to where I should look for feats and possible PrC's that take advantage of having the shape shifter sub type. All sources are pretty much open. Any pointers in the right direction will save me hours of pouring over my books.

Thanks!

[Fax Celestis]

Eberron setting and Races of Eberron might be a good starting spot.

[Coidzor]

The Warshaper PrC from Complete Warrior is always nice for those who have the shapechanger subtype and the ability to make use of it.