Bad picture taking session

I have 50 someodd pictures I took this morning. They were shot inside a gym with only enough light to see what we were doing. Not for taking photos.

Here is one of the worst ones: http://home.earthilink.net/~daveekelly/dsc02388.jpg

As you can see, not much contrast because of the long distance between camera and subject.

Is there any way to improve on these pictures in a batch method with Gimp? Or other software?

TIA
Dave

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A little rum in the morning coffee. Just to clear the cobwebs, ya know.
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