By signing up they will email you when you should contact your Congressmen or Senator about conservation legislation. It is agreat way for a sportsman to make a difference.
Did you know your call can represent 10,000 votes? I am serious, on little publictized amendments, bills, etc, often they get few emails or calls compared to headliner legislation, so a Senator often will look at your contact has representing 10,000 voters. So YOU can make a big difference by periodically contacting them when legislation comes up.
How about telling a friend about the sign up? http://capwiz.com/ducks/taf/ An easy way to tell your like minded friends about signing up to be notified of conservation legislation.