Forgive the pun, but I think it's time to declare a moratorium on the undead.
Maybe it's the glut of vampires and zombies in pop culture, but I am starting to get tired of the number of undead popping up in fantasy RPGs. I can understand why they are used. There is usually an appropriate undead type for a given campaign level, and energy drain is an effective threat against high-level PCs. But it seems you can't swing a re-animated dead cat without hitting a haunted house, or a mysterious tomb or a necropolis full of the walking dead.
There has got to be something else to challenge the players with. Something that can create the same sense of dread. That's not to say that the undead don't have their place, but I think we need to hold back on using them until they feel special again.