This was a really good movie that surprised me in that it dealt with a lot more than graffiti. There are other good hip-hop graffiti flicks out there like Bomb the System and Style Wars, but The Graffiti Artist ends up being more a story about sexuality and finding your place when you are alone and poor.
Another interesting tid bit about The Graffiti Artist is that you have probably heard the soundtrack even though you have never seen the movie. NPR and This American Life use Kid Loco's powerful soundtrack constantly. You can get it on the cheap at emusic.