Crackberry has posted the following details on the Blackberry Thunder's touchscreen...
* Tactile Response - when you press on the Thunder's screen, it pushes in "just" a little bit (the whole screen is sort of like a big button) and you get immediate "real" feedback - you hear an audible clickety sound, and can feel a buzz in your finger where you actually pressed on the display.
* Full QWERTY and SureType entry - hold the phone in landscape mode and you can take advantage of a full-qwerty keypad. Use the phone in portrait mode and you can enter data on a SureType keyboard. You will be able to choose/change your screen/keyboard orientation at anytime.
* Screen is made of glass and will feature multi-touch - the Thunder is said to be utilizing WebKit for it's browser engine (same as the iPhone), so hopefully that means a solid web browsing experience for the Thunder.