Thanks to everyone who replied

Here's the original question:

> I am searching for a way to add x/y coordinates to my point data.
> The catch is that my data is saved in projected units (State Plane 83)
> I am familiar with the "AddXYCoordToFTab" script, but if I run it on my
> data, I get my fields populated with the eastings and northings in the
> state plane units (2,396,915.32/1,012,362.08)  What I want is the true
> lat/lon coordinates.  Is there a script/extension that can do this?  I
know
> that I can jump through a few hoops and re-project my data, run the
script,
> then convert it back to State Plane, but I was just looking for an easier
> path.


I received many good responses, the one that worked the best was an
extension sent to me from Jack O'Connell called "Add Lat/Long Coordinates"
It did exactly what i wanted.  If you would like it, let me know.

Other good responses:

Thanks to Bill Huber for sending this:
Do it with the Field Calculator.  First, create a view (let's call it
"View1") and set the projection to your State Plane projection.  Then,
return to the theme that shows your data, begin editing it, open its table,
and activate (or create, if necessary) the [Longitude] field.  Calculate it
as

         [Shape].ReturnUnprojected(av.FindDoc("View1").GetProjection).GetX

Use the similar "GetY" expression for the latitude.  You can easily turn
the entire procedure into a script using our "Memorized calculations"
extension available at www.quantdec.com/catalog.htm , even if you don't
know Avenue.

Thanks to Alan Sior for sending this script:

'this script will add XY coordinates to point and polygon ArcView
shapefiles, and point, polygon

'HELP:   Add XY//Adds XY co-ordinates to the attribute table of a point or
polygon ArcView shapefile

theProject = av.GetProject
theView = av.GetActiveDoc
theThemes = theView.GetActiveThemes

for each theTheme in theThemes
  'new fields will be double precision by default unless the theme is a
single precision coverage
  doublePres = TRUE
  'only FThemes have FTabs that may be altered
  if(theTheme.Is(FTheme).NOT) then
    MsgBox.Info("This theme is not an ARC/INFO coverage or an ArcView
shapefile.","Theme:"++theTheme.GetName)
    continue
  end
  'check to see if FTheme is editable
    if((theTheme.GetFTab.CanEdit).NOT) then
    MsgBox.Info("This theme cannot be edited.","Theme:"++theTheme.GetName)
    continue
  end
  'get the FTheme's FTab and check to see what type of ShapeClass it
contains
  theFTab = theTheme.GetFTab
  theShapeClass = theFTab.GetShapeClass
  'is it a coverage?
  if(Coverage.Exists(theTheme.GetSrcName.AsString)) then
    'if so, find out if it's a point or polygon coverage, the only two we
can work with
    theSubName = theTheme.GetSrcName.GetSubName
    if(((theSubName = "point") OR (theSubName = "polygon") OR (theSubName =
"labelpoint") OR (theSubName = "node")).NOT) then
'    if(((theSubName = "point") OR (theSubName = "polygon") OR (theSubName =
"labelpoint")).NOT) then
      MsgBox.Info("This operation only works on points, polygons,
labelpoints, and nodes.","Theme:"++theTheme.GetName)
'      MsgBox.Info("This operation only works on points, polygons, and
labelpoints.","Theme:"++theTheme.GetName)
      continue
    else
      'now that we know we have a coverage, see if it is single or double
precision
      if(Coverage.IsDouble(theTheme.GetSrcName.AsString).NOT) then
        doublePres = FALSE
      else
        doublePres = TRUE
      end
    end
    'find out whether it's a polygon coverage, so we can warn the user about
the results
    if(theSubName = "polygon") then
      if(MsgBox.YesNo("Note, this will add the XY coordinates of the
polygon's centroid, not its labelpoint.  Do you wish to
continue?","Theme:"++theTheme.GetName,TRUE).NOT) then
        continue
      end
    end
    if(theSubName = "labelpoint") then
      if(MsgBox.YesNo("Note, this will add the XY coordinates of the
polygon's labelpoint, not its centroid.  Do you wish to
continue?","Theme:"++theTheme.GetName,TRUE).NOT) then
        continue
      end
    end
  end

  'capture the shape field for reference
  shapeField = theFTab.FindField("Shape")
  'create two new fields to the specifications of the ARC/INFO "ADDXY"
command
  if(doublePres = TRUE) then
    xfield = Field.Make("X-coord",#FIELD_FLOAT,18,5)
    yfield = Field.Make("Y-coord",#FIELD_FLOAT,18,5)
  else
    xfield = Field.Make("X-coord",#FIELD_FLOAT,12,3)
    yfield = Field.Make("Y-coord",#FIELD_FLOAT,12,3)
  end

  'if the FTab is currently being edited, make a note so we don't close it
later
  if(theFTab.IsEditable) then
    alreadyOpen = TRUE
  else
    alreadyOpen = FALSE
  end
  theFTab.SetEditable(TRUE)

  'only add the new fields if they do not exist already
  if(theFTab.FindField("X-coord") = NIL) then
    theFTab.AddFields({xfield})
  else
    xfield = theFTab.FindField("X-coord")
  end
  if(theFTab.FindField("Y-coord") = NIL) then
    theFTab.AddFields({yfield})
  else
    yfield = theFTab.FindField("Y-coord")
  end

  for each record in theFTab
    theShape = theFTab.ReturnValue(shapefield,record)
    'if shape is a point or node, grab its coordinates
    'if shape is a polygon or multipoint (polygon's labelpoint), grab the
coordinates of its centroid
    if(theFTab.GetShapeClass.GetClassName = "point") then
      x = theShape.GetX
      y = theShape.GetY
    else
      x = theShape.ReturnCenter.GetX
      y = theShape.ReturnCenter.GetY
    end
    theFTab.SetValue(xfield,record,x)
    theFTab.SetValue(yfield,record,y)
  end

  'if the FTab was not being edited to begin with, close it
  if ((alreadyOpen = TRUE).NOT) then
    theFTab.SetEditable(FALSE)
  end

  'open the table so folks can see the result
  if(theTheme.HasTable) then
    theTheme.EditTable
  end
end

And thanks to Dr. Arun K. Saraf for his advice:

Sometime back I developed an AV extension called as Coordinates Tool Box
(available on ESRI Script page), which does lot many coordinates related
operations including what you have desired in your email. Please hava a look
and acknowledge the same.