I use the Q1U screen like a normal keyboard. So it sits flat on the desk. Althought the extended battery makes the machine slightly higher on one side. But I don't really notice it during use.
On the train, I have it on my lap atop a laptop-bag/briefcase. Basically, the posture for it is exactly same as a normal laptop. Although because of the smaller screen and angle, I have to lift up the machine from time to time to see what I typed because I have IT-induced short sightedness.
When using a normal keyboard, I type with a finger on each hand and then the thumbs for the space bar. On the more compact UMPC screen, I could type at roughly the same speed with my hands in postures similar to as if I was holding a pool ball in each of my palms with the fingers pointing downward and curved inwards following the shape of the ball. I tap the screen lightly using my finger nails, index finger on the left hand, middle finger and thumb on the right hand. I find it an unexpectedly comfortable and fast way to type. Because the onscreen keyboard is compact, there is very little travel for my hands. They just hover over the screen in the same spots.
The UMPC screen is too small for typing with all fingers. But 2, 3, 4 fingers plus a couple of thumbs is definitely feasible. Also the touch screens appear to be hard wired to only register small contact areas. So full finger contact typing isn't reliable. This is very much a hardware design issue. I think the manufacturers should leave it to the user to decide how large a contact area is acceptable. I hope they are reading this.