Actually, you have that backwards. It has it within the native OS (so list menus have Kinetic), but not within most applications (like the web browser).
I agree that Kinetic is mostly a gimmick within the phone's functions, but it would be nice in the browser (which, ironically, is where it doesn't work at the moment).
That's nonsense. It has nothing to do with resistive vs capacitive. It's implemented in software and has nothing to do with the hardware (other than the phone simply being fast enough to support it).
Yea, the new keyboard function is very, very nice! Samsung phones have had that for years. Nice that Nokia has finally implemented it.
It makes the screen behave as if it has mass. If you do a swipe to move the on-screen page or list it will continue to move after you release, gradually slowing down until it stops. The faster you swipe, the faster and farther it will move before stopping.
Currently it is only supported within the phone's native OS, and only in "list" views.
If you want to get a feel for Kinetic scrolling, try the Skyfire browser, it has a somewhat rough implementation.