Is an Ooze or something with Ooze traits a living creature for the purposes of things like
If we look at the entry in the SRD we see:
So it is, unequivocally, a creature.
As for living, the entry doesn't say that they aren't, unlike construct:
And an Ooze does fulfill the major requirements of most definitions of life:
(I'll assume they reproduce, it just doesn't often come up in game except for the varieties that split when you deal them enough damage)
If we look up the Ooze ( http://www.d20srd.org/srd/monsters/ooze.htm ) itself, we find that: "Oozes are amorphous creatures that live only to eat." So the answer, if we take even description as word for word canon, is most likely "yes". :)
Check the creature's Type in the glossary of the Monster Manual. Undead and constructs share the following trait:
If the creature's type does not have this trait, then the creature can be affected. The MM glossary entry for the Ooze type (p. 312-313) shows that they do not have this trait. They are, however, immune to certain other affects: poison, sleep, paralysis, polymorph, stunning, and mind-affecting effects (and blinding, since they have blindsight).
I would classify Vampiric Touch as an energy drain, for this purpose, though the spell description isn't that specific.