Elaine's post prompted me to share my solution to stitching on dark fabrics.
Stitching on dark fabrics can be challenging for some. There are a couple of things I've done to made it easier. For awhile, I put a white pillowcase over my lap and then positioned a lamp so that the light reflected off the white up to the backside of the dark fabric I was stitching on. Currently, I use this:
It's a 12x12" light GE slide viewing light box that I picked up at a yard sale for $1. I just place it on my lap and the light shines up through the back of the fabric.