Since this got bumped up I might as well give an update.
The surviving half is doing very well. As you might remember the cut edges didn't mesh up like they were supposed to but instead created a "swirl". Tissue then began growing up from the column to mesh the two cut sides together. The swirl is no longer evident as the two sides now have new tissue connecting them. The interesting part is the the new tissue on the column and the disk, does not yet have any orange spots like the areas around it.
On a different but related note, I was at a wholesaler's yesterday(no, I can't get you anything) and they had a small (4-5") S. gigantea with a blue base and badly bleached tentacles, a common color combo. The interesting thing was that this anemone had two completely seperate mouths. In addition, when I picked it up, the foot seemed like it was starting to split as well. There was a strip of very dense tissue running across the middle of the foot. Unfortunately, the anemone was not in very good shape and the rest of the carpets in the tank were all in some stage of "melting". I was sort of a good thing for me because I don't have any where to put another anemone anyway.