Are you having trouble taking pictures underwater? Instead of taking them with mere water-resistant cameras, you might want to try theMask from Liquid Image.
The Digital Underwater Camera Mask is a camera in a scuba mask. There is a little targeting area to let you know where to shoot your 5 Megapixel shots. There is an external LED light to let someone else know you're taking a shot.
For just $99, you can have 16MB worth of internal memory, and there is a microSD as well. You can download the pictures to your USB, and enjoy.