Terrific tutorial, thanks very much.
The Curves+v2.4 is no longer available though I did find Curves+v3.0 by googling. The .dll needs to be installed as well as a .dll that ends in [REQUIRED] (if people are still using this tutorial).
I'm hoping someone can help me though, I am unable to get the recommended reversed 's' curve as the top and bottom points remain in the top right and bottom left corners. Can anyone help on my first HDR project?