I've been waiting for this one ever since it was announced. Since I've been playing a goblin in one of the PbPs here on the boards, it was near and dear to me. All I can say is that I loved pretty much the entire book. Paizo's take on goblins is great; I love the meaner, more evil "Gremlin"-y vibe they give off.
My only gripe is in regards to the favored class bonus for goblin rogues - it really seems like there's no reason to take it over the standard bonus. Still, if one line of text is my only complaint, that's pretty darn good.
I was very impressed with this. Use this book and your players will never say "it's just a bugbear" again. I actually liked the interpretation of the ogres best; I can see lots of "The Hills Have Eyes"-like scenarios ...