The Game is the best rapper out there IMO. The song "Letter to the King" is simply awesome. Some how I have feeling that most artists of all mediums really enjoyed TDK. I expect to hear references to TDK and/or Joker/Two-Face in the near future in rap songs, rock songs, tv shows, other movies, etc.
The legacy of this movie definately doesn't end as soon as it's out of theaters. This is going to be a movie that we hear about everywhere and Heath's performance as the Joker will be idolized like that of Pacino (Scarface, Carlitos Way), DeNiro (Taxi Driver, Raging Bull), Pesci (Goodfellas, Casino), Daniel Day Lewis (Bill The Butcher, TWBB) Javier Bardem (NCFOM) and many more.