First up is "Cloudbusting". The song itself is about the relationship between psychologist Wilhelm Reich and his son Peter. As to the video, it was directed by Julian Doyle (who edited the Monty Python films Life of Brian and The Meaning of Life, as well as Time Bandits), and conceived by Terry Gilliam. It features Donald Sutherland in the role of Wilhelm Reich and Kate Bush as his son Peter.
Next is what may be Kate Bush's best known song (at least in the United States), "Running Up That Hill". The concept behind the song is rather hard to describe, although Wikipedia has a good quote from Miss Bush on idea behind the song.
Last is my all time favourite song by Kate Bush, which also happened to be her debut single. As its title indicates, "Wuthering Heights" is based on Emily Brontë's novel of the same name and sung from the point of view of Cathy Earnshaw.