Powerplay, for me, is a very abstract yet broad topic.
It is about individuals using various tactics in order to 'climb the ladder'- that's to say to manipulate others and stay in a high, if not top, position.
Then you have to go into various concepts of powerplay such as
* gender power (man vs woman)
* power vaccuum (what happens as power falls, think of Iraq)
* oratory techniques in gaining power (such as rhetorics, parallelism)
Some texts that are pretty well known in this subjects: Animal Farm (text, or animation), 1984, Wag the Dog (a satirical view)
Also have a read in newspaper, I am pretty sure there are lots of examples of Powerplay at this moment.
Also,
* First episode of Seachange
* The West Wing
* Richard III
Hope that helps!