A high school classmate showed me this, and I think it is very applicable to geocachers. It's called NOAH, Networked Organisms and Habitats, a NatGeo thing. I don't have a smart phone, but if I did, this would be very cool.
You can learn the official word about it on this page. I think it looks fantastically fun and a great match for cachers since we're out and about all the time. Similar to Project BudBurst but not nearly as focused, players take photos of interesting things they come across. The app takes care of location coords. A field guide is included, but I'm wondering how useful it really is.