We had some severe weather roll through and I took some lightning photos. These have been added to a new weather gallery and you can check out others and details there.

Canon Digital Rebel XTi, Canon EF-S 17-55mm f/3.5-5.6, 30s exposure, f/7.1, ISO 100.
To take good lightning photos in the dark, you need a tripod. Set the camera on the tripod and choose an aperture around f/7.1-f/13 and an exposure time of 30 seconds or more. Use ISO 100. I used the self timer to actuate the shutter without shaking the camera, but this may not be necessary. Then, just take long shots until you happen to catch the lightning in action. I chose a wide angle focal length but this isn’t strictly necessary. However, it does increase the changes of seeing some action since the field of view is wider.