djw60 wrote:
From a single image, upload to your computer, then make 2 more copies, (or more), and change the brightness on each of the copies. If you are using 3 photos, keep the original as is, on the copies, turn the brightness halfway down on one, and the brightness halfway up on the other.
The way to the best results using this method would be to use RAW images and not JPEG. Although, either way, like you mentioned, this is not true HDR and a single RAW in Photomatix is going to be better anyway.
A suggestion (and only one that is my opinion as I have done this sort of faux-HDR myself) is to be more conservative with the saturation.