The iPad 2 is 9 1/2 inches tall and 7 1/3 inches wide with a 9.7 inch screen measured diagonally. It is also amazingly thin at around 1/3 an inch in depth and weighs around 1.3 pounds, which is slightly lighter than the original model. The 3G model weighs slightly more than the Wi-Fi model, though you wouldn't be able to tell the difference without a scale.
The original iPad is the same height and width as the newer model, but at 1/2 inch in depth, it is slightly thicker. It weighs 1.5 pounds.