Ever since Apple launched the iPhone in 2007, touchscreens have been the rage in the world of high-end mobile phones.
Their advantages are obvious; by doing away with a keypad they release space for a bigger screen, which comes in handy for watching videos or surfing the web.
Secondly touch interfaces are sometimes more intuitive to do things like navigating menus and scrolling through your photo collection.
The N97 has a resistive touchscreen unlike the capacitive touchscreen of the iPhone. It's not as responsive as the iPhone but on the plus side it supports stylus use and features like handwriting recognition.
Compared to the earlier touchscreen Nokia 5800, the N97 is a lot more responsive and user-friendly. It also boasts a 360X640 resolution, significantly higher than the iPhone.