Nice, original take on gods of death. Each god is a unique entity unto himself, and their churches are well thought out and would mesh well in most games. The few new magic items presented make sense and fill in a few blanks. (So how does a vampire travel cross country with his coffin anyway? No worries, when it's a folding coffin!). The Dhampir prestige class may be a bit unbalancing to allow as a player, but makes for a nice NPC option. But if you are running a powerful game, it won't be an issue.
[4 of 5 Stars!]