I don't have a single screen in my office that I can't write on.
This includes my main desktop display, which is a 21" Wacom Cintiq display tablet. Here's a picture of me using it in the drafting board format. I don't use it this way very often, though, because I normally pick up my Tablet PC when I want to do some heads-down sketching.

What I like about this gigantic tablet is that I can always have InkSeine running on my desktop computer. I use it almost like a desk blotter - I can drag stuff onto it or jot down little notes whenever fancy strikes.
The Cintiq is large enough to use as a shared display for one-on-one meetings. In the example I've captured below, I collected together some initial information, and then my colleague Ravin joined me and we talked about some research stuff. I jotted down some of our discussion points as we chatted.

Even though I have two pens for this big tablet, I've found that in meetings of this sort, one person at a time always drives the pen. I jotted down all the notes shown above. On some subsequent pages of this note, there are some diagrams and ideas that Ravin sketched out.
What's the worst thing about having a big honkin' display tablet as my desktop computer? Well, the pen for it is not compatible with Tablet PC's. This means at least ten times a day I attempt to use my Cintiq pen on my Tablet PC, or my Tablet PC pen on the Cintiq. In either case, no joy is to be had.
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