A recent encounter brought me to think about this question. If you are a sufficiently powerful divine spellcaster, and you somehow become a type of undead that lets you keep your class levels, say, for example, a ghost, could you successfully cast resurrection on yourself?
Sure, but you'd have to destroy yourself first. You cannot, as a rule, cast resurrection on a non-destroyed undead. I suppose you could use the contingent spell metamagic feat for some wacky hijinks.
In the case of a ghost, you'd also need some bit of your corpse--resurrection requires at least a little bit of remains to work with, even if it's the dust left over from disintegrate.
Ah right, it only works on an undead if they have been destroyed. That certainly makes it more difficult.