One of the main reasons why I upgraded from a Nikon D70 to a Nikon D200 is the vastly improved quality of available light photographs. I shoot a lot of indoor swimming pictures, often in poorly lit swimming pools.* I created a comparison album with a couple of typical pictures so you can see the difference.
Take a look and be sure to turn on the “smugloupe” feature. It will create a “magnifying glass” so you can see the photographs in detail. Alternatively, you can download the original camera files to your computer and examine them with your favorite image processing software.
* OK, I am actually next to the pools, not in them. 🙂