Cloud advice please
 

This photo is untouched (apart from slight crop and cloning out a sun spot).
It was my first opportunity to try out a new wide angle and I only had time for this one shot.
I have CS3 and am learning the basics.
Is there any way of improving the clouds on CS3 with e.g. a graduated or polorising filter ? I have gone through all the obvious options via the drop-down filter but cannot find one.
Any other suggestions are welcome but I'm mainly concerned with the clouds.
(I realise the spot filter was on-I was photographing birds at the time and didn't change it)
Thanks

Dave, have you seen this thread?
http://www.worldphotographyforum.com...ead.php?t=3427

Thanks for that-I have put it on my favourites and will spend some time on it.
I did go through all the various sections and couldn't see anything directly related to my question i.e. is there anything in CS3 which will allow me to add graduated/polorised filters to the cloud. (there is a section on 'blend modes' which is a bit deep for me).

Just followed the original link, the guy has now made the tutorial a "paid for" one. It simulated an ND grad using photoshop. I'll dig a tutorial out, there's bound to be loads on youtube.

Edit: search on youtube for photoshop ND gradient filter and you'll find plenty of tutorials.

Try this one:
http://www.youtube.com/watch?v=gN2T5YM3orw

To spell it out:
Open your image in photoshop
Copy the image onto a new layer (Ctrl J)
With the new layer selected add a layer mask (darkish rectangle with pale circle in the bottom of the layers pallette. Or, Layer > Layer Mask > Reveal All)
Set foreground colour to black, background colour to white
Select Gradient tool and check that tool is set to linear gradient from the options in the top toolbar
With Layer 1 selected (the copy of the layer), set the layer blend mode to multiply
Start at the bottom of the frame and drag the line for the gradient tool upwards in the image
Experiment with start point, end point and layer opacity until you get the effect you want.