If you drive down the street you see millions of cars that look very much alike, but car makers don't waste time suing each other over style similarities because they can rely on the performance specifics of their cars, and the buyers will compare and choose what's best for them.
Apple must be very worried about the slew of tablets coming out and it knows that its window of dominance is closing.
They are afraid of the competition.
I was playing with a Xoom last week, and it's every bit as good as the iPad2, even without its Flash or micro sd card slot active yet. Honeycomb is a fantastic OS and Apple knows what this means. I am very pleased with the emerging competition. It's good for the consumer.