what a great thread! I'm still new to lightning photography. Lately I've been getting into shooting time lapses and decided to use that method to capture lighting. I have a remote that allows me to shoot at intervals and the last storm that passed through, I just set my camera on my tripod, set the camera to shoot one 10 second photo after another. Once the storm had passed, I went through all the images and sure enough I got lucky with one.

Canon EOS 1D MK IV, Canon EF 70-200mm lens 10 sec exposure @ f/4, ISO 100, 70mm, -1.0ev
I'm on my blackberry so I'm not sure how this will work. But if the photo didn't attach, here is the direct link
Windsor Lightning | Flickr - Photo Sharing!
looking forward to seeing how others shoot lighting!