Well, as long as you aren't using AutoCAD 2011 you could use acad_strlsort .. or perhaps vl-sort ...
What's wrong with acad_strlsort in 2011?
Unless they have fixed it in a service pack, the first drawing you use acad_strlsort in AC11 it works as expected, when you open a second drawing and use it, an error is generated that says "incorrect number of arguments".
The steps to reproduce are:
Open AutoCAD 2011
Ensure SDI is set to 1
At the command prompt type:
(acad_strlsort (list "d" "a" "b" "C"))
The return value is ("a" "b" "C" "d")
Now open a second drawing in the same session:
At the command prompt type:
(acad_strlsort (list "d" "a" "b" "C"))
The return value is:
Error: incorrect number of arguments.This issue has been escalated as a bug at Autodesk so they can resolve it .. hopefully they did .. don't use AC2k11 so I don't know.