OK - Let me start by saying that even though I haven't checked, I'm certain that the following procedure is illegal in ANY country, and therefore all the normal disclaimers apply... But "hypothetically" the following is possible (I, off course, have never done this..) Lets say you have a cheap "point and shoot" digital camera, and you put it on a lanyard so it will fit around your neck and snugly inside your jacket (against your chest). I'm referring to those cameras that DOESN'T have the lens that comes out if you switch it on (in other words - no zoom lens, although it must have a screen). These cameras are easily operated with one hand only (hold it in your right hand, and use your index finger to press the "trigger"). Only problem is that your cant operate the camera and the throttle at the same time, plus its impossible to look through the view finder and keep control of the bike. This is where the screen comes in handy. You hold the camera with your left hand - upside down, you use the screen to compose the shot (rather than the view finder), and press the trigger with your thumb. The nice thing about this is that the shot actually appears right way up on the screen, but when you download it to your PC, the photo will be upside down. Its then a simple matter of rotating the picture 180 degrees before saving it. If you have a regular riding buddy with his/her own bike, who also has a camera, you can take shots of each other (and the scenery) while riding.
