My favorite song on the radio right now is "Welcome to Jamrock," by Damian "Jr. Gong" Marley. He's Bob Marley's youngest son, but it doesn't sound at all like Bob. "Welcome to Jamrock" is much more a dancehall protest number than it is roots reggae.
It's a dark song -- references to gang wars and political murders (here are the lyrics). You can also watch or download the video (very, very small!) here.
Incidentally, people coming to this blog via Google (there seems to be lots of you) might find some of my other stuff on reggae. Like this post, for instance.