The 3E Main FAQ has this to say about stacking temporary hit points:
How is the body feeder weapon quality supposed to work?
Do the temporary hit points from the weapon stack? The
same question applies to mind feeder weapons and to spell
effects, such as vampiric touch.
Temporary hit points from a body feeder weapon stack with
each other, but not with temporary hit points from any other
source. Likewise, temporary psionic points from a mind feeder
weapon stack, but not with temporary psionic points from any
other source.In general, any effect that allows you to gain temporary hit
points over time allows you to stack those points, but only
those points. For example, if you use the vampiric touch spell,
the temporary hit points you gain from that particular casting of
the spell stack. They don’t stack with the temporary hit points
you get from an aid spell, nor would the effects of two
vampiric touch or aid spells stack. If you were to use two body
feeder weapons (or two mind feeder weapons), you could not
stack the temporary points from the two weapons.
So, assuming you accept this answer as valid and applicable, you have to decide:
Are two applications of Divine Vigor the same as two hits from a Body Feeder weapon, or the same as two castings of Aid?
If the former, the temp hit points (according to the FAQ answer) would stack. If the latter, they would not.
The bonus to speed, as Pax notes, certainly does not stack.
-Hyp.