Pretty much exactly as I'd use it.
Yeah, I knew Wacom had monitors now, but $$$, I mean, people think Apple carries a premium. Its why, even without being as comprehensive for pen input as a Wacom digitizer, a tablet with a half-decent stylus input could function as a solid replacement for that, and so if you could get that along with everything else a tablet offers, for basically the same price as a comparable sized Wacom tablet, it actually ends up being a bargain.
If Microsoft or Google wants to get something to trump Apple, it would be developing and licensing good digitizer input for tablets. The Courier concept that Microsoft had would've been very cool. You could be typing and then when you're in class and you need to draw a diagram or something you could just pop up a note on the other screen and draw it there, then tie it to that part of your typed notes. Plus, you could have images up or whatever else (parts of the textbook or whatever).
I've been waiting for a digitizer where the pen is more like paint brushes, so that you adjust your input based on the pen you're using. This way you can change both your input but also get more realistic feedback through your hand (i.e. using a wider brush feels different than a narrow one, etc).
Dell actually has a touchscreen LCD that's interesting. I've been using it, and its...I'm not sure what to make of it. On the one hand, its a 21.5" 1080p IPS LCD for about $300 which is pretty good on its own. Then, you've got touch input. Its ok in that respect. The cool thing is you can use whatever as a stylus. I actually use paint brushes, but it doesn't function perfectly, because it doesn't work like my concept input in the previous paragraph. The big issue is that its aimed at using your fingers for input, and so the precision and responsiveness is a bit lacking. Also, since it views your finger the same as the stylus, it has this onscreen mouse that is infuriating when you're using something for drawing or things like that, which if it was a true stylus you could turn off touch input and just get stylus input. I'm probably going to sell it though, as I can't use it very well which would be able to be remedied with a nice flexible monitor mount but it can't (the back is a big piece of plastic with no mount points).