All digicams and DSLR are more or less sensitive to the near-IR light spectrum. Most recent multimegapixel digicams are in the "less" part of the range, but with long exposures and tripod something can be done. All you need to do is to cancel in some way the visible light spectrum, so the camera only uses the IR part of the spectrum for the picture. This can be done with an IR filter.
You can buy it or you can make a handmade one to test if the results are ok for you.
My handmade filter was made with 2 or 3 layers of totally overexposed film negatives (as the ones found at the begining of the roll). With 2 layers, some visible light is present, so falsecolor pictures are taken. With 3 layers, only IR light is present, and the pictures are B&W. I've "attached" the filter simply taping it in the front of the lens, one layer at a time.
In the center of the picture I've noticed a less contrasted and lighter area. I've corrected that in photoshop. I've assumed a filter problem, but later I've read is a lens problem. Some lenses (as the S50, G3 included one, or the 18-55 kit lens) have this "hot spot", some others (as the Sigma 20/1.8 or the 28-135IS) have not.
The Handycam filter is similar, but it has only two layers, because the camcorder is much more IR sensitive and it has less visible light contamination.
Also an unexposed (black) slide film strip can be used instead of the overexposed negative.
This works because film emulsions only block visible light and the film itself is transparent to IR light. That's why you must never use a black stripe of film (of any kind) to see eclipses or the sun, because all IR (and probably UV) radiation is still there!!!!