Thanks for the pointer

I'll try to track it down (though, if "SS" is "Savage Species", that template doesn't seem to be there!)
I believe the
Savage Species template in question is Incarnate Construct.
Beyond that, I don't know of too many templates designed to de-power creatures, though there are a few.
Silverthorne Games'
Book of Templates Deluxe Edition 3.5 has exactly three templates that decrease a creature's power: the Blighted Thrall (a creature that has failed a trial set by its god), the Degenerate (inbred and corrupted), or Miniature (which is self-explanatory).
There's an epic-level de-powering template in Inner Circle Games'
The Complete Book of Denizens, the Bygone Creature, where the creature is basically just a sort of "living echo" of a more powerful creature...but again, it's for epic creatures only (it lowers the CR by -6).
And if there are any suggestions out there for low-level (1-4ish) incorporeal monsters besides shadow and allip, i'm all ears!
The problem with low-level monsters is that at that level, PCs are likely to have no real recourse for attacks that overcome the 50% miss chance. No one will be able to afford
ghost touch weapons, and there are very few force-based spells that can be put to use (
magic missile being one of the very few).
Having said that, your best bet might be to use the advancement rules in reverse on some more-powerful incorporeal creatures to lower them to the point you want - though you'll have to eyeball their special abilities and see what needs to be lessened, if not removed altogether.