If you are at all interested in astronomy (and have an iPhone/Pad) the latest app I bought, Star Walk, is seriously fun, as well as educational.
Navigate the heavens and view where the constellations are; hold your iPhone up to the sky and find out what you should be seeing if it weren't for sky pollution; learn about stars, satellites, meteors etc; look up sun, Moon and planet rise & set times and elevations, etc.
Plus free photo of the day;
Hubble photograph 'light echo' of star V838 in the Unicorn constellation mysteriously erupting.
Lots of features and hours of starry-eyed entertainment. Highly recommended.