http://blastr.com/2011/01/found-gene-roddenberrys-original-1964-pitch-for-star-trek.php (http://blastr.com/2011/01/found-gene-roddenberrys-original-1964-pitch-for-star-trek.php)
A pop culture blog called Between the Pages has a link up to an online copy of Roddenberry's initial outline for the series, dated March 11, 1964.
http://leethomson.myzen.co.uk/Star_Trek/1_Original_Series/Star_Trek_Pitch.pdf (http://leethomson.myzen.co.uk/Star_Trek/1_Original_Series/Star_Trek_Pitch.pdf)
The description of the Captain's Yeoman pretty much describes Grace Lee Whitney from where I sit.
That's a pretty interesting pitch.
I recognize a few outlines from "Other story springboards..."as episodes from TOS:
Perfect world - The Return of the Archons
The Man Trap - Shore Leave
Camelot Revisited - Patterns of Force
100 A.B. - Miri
Kentucky, Kentucky - The Omega Glory
Torx - Operation Annihilate
I'm thinking the others may have been used in the subsequent series.