Desdichado
Hero
It seems Ghostwalk is best used as is, as a complete campaign setting on its own. However, the basic premise of it doesn't particularly appeal to me, so I doubt I'll ever run it (although another guy in our group might -- I actually read his copy.)
Other than that, the ghost feats might be useful for incorporeal undead in a regular setting.
Other than that, the ghost feats might be useful for incorporeal undead in a regular setting.