Right after Apple released their iPad commercial – HP made a commercial of their own:

I like how the HPSlate commercial has a dark background instead of the iPad’s bright one. And the Computer is Personal again is a nice jab at Apple although — I don’t think it is quite effective. It separates the iPad’s category from the HPslate. I am surprised that not many features were shown on the HPSlate video, the iPad Ad clearly, had more substance then the HPSlate one