Definitely need Ping for apps. The genius recommendation engine is a start, but I've already gone through those and got what I want and now there's nothing new

Definitely need Ping for apps. The genius recommendation engine is a start, but I've already gone through those and got what I want and now there's nothing new. Also, it only tells me about categories of apps that I already know I like and will use, such as photography apps and games. What if there's a whole new category of apps that I would find useful? Ping would be great for me to find those new categories.