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On a WP7 device I have a canvas. When the user touches anywhere on the canvas an image is displayed at that position.
I want to add a feature where if a user touches and holds the screen with one finger and then touches the screen in another place with a different finger an image is also displayed. So basically I want to be able capture and respond to the second touch in the simplest possible way. Any ideas?
Have you taken a look at the GestureService? The Pinch* events let you handle two simultanious touches.
See example.