NWF looks like a solid group w/good programs. We might look into them a little further, but they look like a good group to affiliate with.
On that subject in general, not to be negative but you know we do need to watch who wants to be our pal. I'm sure I'm preaching to the choir here - I'd imagine you all know more about this than I do - but there are some environmental groups with weird agendas, and some of them have progressive faces but are backed by deep-conservative, big-industry and lobby money, and college enviros are easy targets for greenwashing publicity. I think that's less than one in ten, but the front-groups do exist. That being said, NWF looks fine.
By the way, Carly got me to enter some of my wildlife work in their yearly NWF photo contest. Don't worry - I'll still be humble when I win and become a world-famous wilderness photog.