Jess,

As my understanding of what you want:

I made a psd with the following layers (from the bottom up) background (white), blue (a layer with something blue on it - layer name "blue"), green (a layer with something green on it - layer name "green") and finally red (a layer with something red on it - layer name, you guessed it "red"). The script will then save out layers, red, blue and green as TIFFS with the layername as the filename

This script will work but it assumes a couple of things:

1, the top layer is your shading layer,

2, the background is included.

I wasn't sure if you ment "groups" as in a number of things or layersets (layer groups) so those will get exported but will be blank

// tiff export with shaded layers
// use at your own risk

// call the source document
var srcDoc = app.activeDocument;
var numOfLayers = srcDoc.layers.length;

// main loop starts here
for (var i = numOfLayers -2; i >= 1  ; i--)
{

    //var tempLayer = srcDoc.activeLayer.name;
    var tempLayer = srcDoc.layers[i]

    //switch other the layers off
    switchAllLayersOff(i)

      if ((i != numOfLayers -1) && (i != 0))
        {
          srcDoc.layers[i].visible = true;
          decantLayer(tempLayer.name)
        }

}//end loop

function switchAllLayersOff(idx)
{
  for (var m = numOfLayers -2; m >= 1  ; m--)
  {
      srcDoc.layers[m].visible = false
  }
   srcDoc.layers[0].visible = true;
   srcDoc.layers[numOfLayers -1].visible = true
   srcDoc.layers[idx].visible = true;
}


function decantLayer(layerName)
{
// =======================================================
var id21 = charIDToTypeID( "Dplc" );
var desc7 = new ActionDescriptor();
var id22 = charIDToTypeID( "null" );
var ref5 = new ActionReference();
var id23 = charIDToTypeID( "Dcmn" );
var id24 = charIDToTypeID( "Ordn" );
var id25 = charIDToTypeID( "Frst" );
ref5.putEnumerated( id23, id24, id25 );
desc7.putReference( id22, ref5 );
var id26 = charIDToTypeID( "Nm  " );
desc7.putString( id26, layerName );
executeAction( id21, desc7, DialogModes.NO );

// Set filePath and fileName to source path
filePath = srcDoc.path + '/' + app.activeDocument.name +'.tiff';

// save out the image
var tiffFile = new File(filePath);
tiffSaveOptions = new TiffSaveOptions();
tiffSaveOptions.byteOrder = ByteOrder.MACOS;
tiffSaveOptions.layers = false;
tiffSaveOptions.transparency = true;
tiffSaveOptions.alphaChannels = true;
tiffSaveOptions.embedColorProfile = false;
tiffSaveOptions.imageCompression = TIFFEncoding.TIFFLZW;
tiffSaveOptions.saveImagePyramid = false; 

activeDocument.saveAs(tiffFile, tiffSaveOptions, false, Extension.LOWERCASE);

//close that document without saving
app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

// selects document that's been open the longest
app.activeDocument = srcDoc;
}

Copy the code above into a text editor, save it out as "myexportscript.jsx" or something, put said script in the Adobe\Adobe Photoshop CS4\Presets\Scripts directory. Next time you run Photoshop you'll find the myexportscrip script on the file>scripts menu.

Hope it works for you