There's a great live recording out there somewhere of Ziggy Marley and John Popper doing "No Woman, No Cry." I'm not sure what album it is on, but you might be able to find it on Google. Listening to it could probably give you a good feel for how to play the harp in reggae music.
Hey... There are a lot of Carribean/Latin resturants opening up recently in my town and being from Tampa Florida, I wanted to see if I can play in those places. Does anyone out there have any info that can help me get into some more Bob Marley, Jimmy Buffet, etc....type material?