Binarysunrise,
here is a link to a site I didn't see listed in your references:
http://hometown.aol.com/comicsproj/credits.htmlIt is listing of credits to most U.S. newspaper strips up until comparatively recently.
It lists the following as writers on the strip, without specifying whether dailies or Sundays:
Jerry Siegel 1939-1943
Whitney Ellsworth 1941-1945
Alvin Schwartz 1944-1958
Jack Schiff 1942-1962
Bill Finger 1959-1966 (this is what it seems to be saying)
Jerry Siegel 1959-1966
It lists Al Plastino as an artist in the 1960s, also Wayne Boring from 1948-1966 - although he definitely started earlier, and did not stay on the strip throughout this period, obviously.
With regard to Boring, he did not do any work on the comic books for the period 1962-1966, then made a brief comeback in the comics around 1966-67.
I am pretty certain I read somewhere - unfortunately I can't recall where, possibly a comment by Mort Weisinger in the letters' page of a Superman or Action Comic from this period - that the reason Boring was missing from the comic books for these four years was that he was doing the newspaper strip.
It may be that Plastino replaced Swan in 1960 on the newspaper strip, and he, in turn, was replaced by Boring in 1962, and stayed on it until the end, in 1966.
At least that's my hypothesis, but I have never actually seen any Superman newspaper strips from the 1960s.
I don't have the original of
Giant Superman Annual #1, but I do have the replica edition, from 1998.
It does have three dailies from 1953 (no precise dates discernable), on the inside back cover - strip numbers #4503 ("It's Murder!"), #4504 ("Strange Corpse!"), and #4505 ("Everyone's Rushing!").
The overall title of the continuity is not given, but the story is credited to Alvin Schwartz (writer), and Win Mortimer (artist).
Incidentally, Schwartz was awarded the "Bill Finger Award" just the other day, for excellence as a comic book writer. He is still living, and was born in 1916 (see this link for details:
http://www.newsfromme.com/archives/2006_05_25.html#011552).
I don't know whether any other dailies have been reprinted in the comics, but I have a feeling I may have seen some somewhere. I'll check my other Superman Annuals.
The next issue of
Alter Ego apparently will have an interview with Al Plastino, so you may want to check that out.