Wow! That looks great. 400 pics is worth it when you finally get that one perfect shot! Dugg it too...
Thanks for the Diggs everyone and I agree, I got lots of exposure (even if it's not to my site) from this pic. Well worth the time that was put in.
Also, here is a link to one of the darker images, but you can see there are some mean looking clouds... http://www.dragsource.net/judd/images/clouds3-2.jpg
Lightning is T&E for sure (Trial and error). The best way is to use a long exposure. Depending on the frequency of the strikes, I'll usually use 20-30 seconds per picture.