This is pretty handy for learning the basics of getting the right subject, light, depth of field & perspective. In half an hour:
Mr Pocket Chris talks a little about the psychology behind the way us human folk look at and react emotionally to photos too, which helps you choose what to shoot, and when. Plus it increases the chances of your friends saying “OOOOOH!” and “WOW!”.
And the best bit? An ingenious scroll-wheel that shows you the same photo taken with different camera settings & from different viewpoints.
Basic tutorials are free. More advanced packs are £1.49: http://pocketchris.com/