Over the past month I (Josh) have been having fun trying my hand at photographing lightning at night. Here are a couple results.
Lightning from our training course near Monument, CO
My current favorite from Monument.
With a friend's lens that had better zoom than mine.
This shot is on a hill near our house overlooking Lakewood and Denver. Notice you can see the city lights, two lightning strikes, and in the upper-right you can see part of the constellation Scorpius.