What are you referring to? The iPad has a 9.7" screen and the Xoom has a 10.1 inch Wide angle screen... both are quite usable for their purpose as tablets. The 7 inch screen "tablet" are what I would consider too small to be useable at just 45% the area of the iPad. The Xoom is just 2.9 square inches larger than the iPad.... it's a bit longer than the iPad screen by about an inch while the iPad is wider than the Xoom's screen by about 3/10 inch.
Reviewers say the Xoom is designed to be used in most conveniently in landscape mode while the iPad can be used either way.
ahh then I sit corrected. the only non-ipad tablet I have seen in the wild has been of the 7 inch varieties.
still I wish the windows tablets, like the asus, were much less expensive.