Are there many shows that star non-caucasian actors as the main characters?

As I was watching television today, I realized that I have not seen a lot of shows wherein any of the main characters are not white. I’ve seen plenty of shows with secondary characters that are not white. Even some shows with large casts where a large number of people are the main characters have those few non white actors. For example, Firefly has a main cast of between 8 and 10 (I can’t remember at the moment, forgive me fellow Whedonites) and two of them are black, but what of other shows? Can you give some examples?