I have always wished to be able to use a computer monitor for precise focusing. With live view and tethered shooting this is actually possible at least in a studio environment.
But even if you only used the zoomed in view on the camera display screen live view still allows much more precise than other focusing options. Autofocus is not very precise and quite often focuses the wrong part of your photo. Precise manual focusing is almost impossible with a modern focusing screen that is optimized for brightness instead of focusing accuracy. This leaves life view as a focusing tool.
I think live view zoomed in is the only way to consistently get absolutely correctly focused photos. Unfortunately it is slow and fiddly and works best with your camera on a tripod.
Live view allows you to focus precisely but it is not very fast and you no longer see the framing of your photo if you zoom in to judge the sharpness. Another problem is that at close distances you or your subject may move between focusing and exposure.
So I wonder how those of you who already have a camera with live view deal with its problems and how useful it actually is in praxis.