I really wish there were more apps like this (and Shazam). Just off of the top of my head, i'd pay a reasonable amount of money to identify: bugs, fish, seashells, animal footprints, mushrooms, and I'm sure a whole lot more.
Being part of a hiking family with two small kids, the questions are endless and even if it were crowdsourced in some way (e.g. please identify this bug for karma), it could be handy learning tool for kids, getting them more excited about science at an early age.