In my homebrew I have made the Drow elves slaves to the death Gods and all raise spells summon a drow elf so that the party may barter with them for their friends soul back. The cost of the raise depends on how badly the death god wants to keep it (Level). Many times this has lead to the trading of magic items or a piece of each players soul (XP) as well as a part of the deceased's soul for the character to be brought back. This usually means that a strong bond between characters must exist before a raise will happen. The players seem to like it and it has made for some very cool roleplaying moments.
As for save or die spells, I try to avoid them when I can, but I like the idea of -1 hp if you fail the save.