Bob was quite right...I just asked him to let some of the newer guys take a shot at this first! Thanks, Bob!
I posted it because the idea of flipping the switched receptacle is one of those "trade practices" that almost everyone learns as an apprentice, but is not mentioned in any code book,or DIY manual I've ever seen.
Besides the "it don't work" cmplaint Big John mentioned, I have seen instances where the switched half was fed from a different circuit than the other half- and some maintenance guy, not "in on the secret" just replaced the "non working" receptacle ....with spectacular results when the switch was later flipped!
This, in turn, brins us to point #2: it never hurts to treat every wire as if it were hot- even if you're pretty sure it's dead. There just might be a switch somewhere....