If you enough of a nerd,
Skyguide. Shows all stars and constellations, satellites, planets, etc. Just hold to sky and it shows and names what you see. Pretty cool on a moonless morning on a stand waiting for sunrise.
Vtree ID. Tree Id guide by VT/ you should like that I'm assuming.
Leafsnap. Another tree guide with awesome pics.
DirectTV. If you have that, you can record at home by way of phone in addition to watch tv if that is your thing.
Topomaps+. Self explanatory.
Medscape. Drugs, interactions, uses, prescribing info.
Flixter. Movie reviews and showings.
AroundMe. Shows restaurants, gas, stores, etc near your location.
I could go on...I may not be young, but I am connected. Enjoy.