I’ve been waiting for the WP7 reviews to hit because I was hoping to get an answer to a question that’s been nagging me for some time - what’s WP7’s killer feature? After all, the smartphone market is a highly competitive arena, and the best way to do that is to have that one, must have killer feature. Then, the rest of your product doesn’t have to stand head and shoulders above the crowd. Consumers can then assume that product A is similar to product B, except that Product A has Killer feature X and product B has killer feature Z.