Target training can be used in advanced tricks as well - such as teaching a bird to touch an object on cue, walk/fly somewhere on cue, etc. It can even be used to teach birds how to play with toys they are afraid of (even if the bird is completely tame), teach them to go back to their cage... with birds who are cage aggressive when it comes to toys/food (but not aggressive when out of the cage), you can teach the bird to target then to station so that you can easily, and safely, change out the dishes.
Karen Pryor, Melinda Johnson, Susan Friedman and Barbara Heidnreich all have great articles and media. Melinda Johnson (via Karen Pryor's website posted by Lene) has a great clicker training book and Barbara Heidrenreich has great videos. Barbara doesn't use a clicker, but the videos themselves are great visuals on how you should be teaching parrots, and she has a great video no parrot behaviors as well.