Lot's of us - UX people. Love to start their work on paper. Either sketching or using sticky notes. What's the next step for you? I usually redraw whole paper prototype in Axure. Making the same thing twice and than going deeper into details (functional, not considering fidelity).
We've created tool in which you can take a picture of paper prototype and make it digital automatically (fully editable wireframe): http://uxpinapp.com
Would it be useful in your design process?