Yes there is. http://www.dpreview.com/reviews/canons45/page6.asp
Scroll about halfway down. It's the white balance / exposure bracketing button.
When you look at the three photos, are they all the same exposure?
Glenn
Very true. I knew there was at lest one camera out there that was DSLR-ish that had a live preview, but since we were talking about a D70, I figured it would be best to leave the exception out. My mistake.
Glenn
You seem to be saying the display screen can be used to frame the photo. DSLR's don't work that way. You have to look through the viewfinder (and therfore the lens) to see what you are pointed at. The display is only used for replay of photos after they are taken.
Glenn