The Galaxy Tab has a 7-inch display with a wide-screen-ish 16:10 aspect ratio. While the iPad has a squarish 4:3 display that is much wider at 10 inches.Talking of width, the Galaxy Tab when held in portrait mode measures at 120.45mm whereas the iPad has a much bigger 189.7mm width. From the video, it seemed obvious that the Galaxy Tab’s width was small enough for the person’s thumbs to easily reach the middle area of the QWERTY part without too much stretching.We already know that typing on a smaller device like the iPhone in landscape mode is quite easy.The iPhone when held sideways measures at 115.2mm, which is just 5mm smaller than the Galaxy Tab’s width when held in portrait. The 4-inch screened Samsung Galaxy S’s width when held across is actually slightly more than the Galaxy Tab. Although the Galaxy Tab’s keyboard seems quite bigger than what you’ll find on cell-phones. That’s basically because the size of each individual keys is bigger; it is pretty much making use of the larger screen area.Source:techtree