Here is the sum total of my lice knowledge:
I used Rid, but waited too long to do the second treatment. You have to follow the directions EXACTLY.
We went to hair fairies: http://www.hairfairies.com
The were a fortune, and I bought all their products, because I like going to a specialist.
Tea tree oil (from whole foods) is a good preventative - put a few drops in the shampoo. Don't douse your brush with it and brush it through your hair or your husband will think you smell like a eucalyptus forest and suggest that you take another shower.
I believe Paul Mitchell also sells a shampoo with tea tree oil in it.
A teacher I know avoided lice by putting tea tree oil around her hairline and wearing her hair in a bun or braids. Keeping your hair up seems to be a common preventative.
Wash everything in hot water.
The lice combs don't get everything out, and sometimes you have to use your $15 tweezerman tweezers.