Both the iPad (right) and Galaxy Tab use a multitouch, capacitive touch-screen keyboard for text entry. With the Tab in landscape orientation and the iPad in portrait mode, the keyboards are approximately the same size with similar key width.
The Tab has two unique keyboard features that give it an advantage over the iPad. It includes Swype technology that allows you to slide your finger around groups of letters to quickly input common words. Also, it uses haptic feedback to give your fingers a reassuring buzz when you strike a key.
That said, typing on the Tab presents some ergonomic challenges. The space bar is small, making it easy to miss in both landscape and portrait modes. Held in portrait mode, it's easy to type with your thumbs (unlike on the iPad), but held in landscape mode, the larger keyboard isn't quite large enough to use comfortably with two hands--yet too large for comfy thumb typing.