Originally Posted by DWB

I'd ask Paul Markham. Sending him an IM now to get him in here.

However, in the event he doesn't show up, I will give you my two cents. Unless you know about the niche you are trying to promote, it's probably best to skip it and promote one you do understand. Promote what you enjoy personally, what gets YOU off. Focus on that and work will not only be more enjoyable, but you will work harder at it which will hopefully pay off down the road.