I agree with Ning Zhang.

Here are a couple more.

1) Printing flesh : http://gizmodo.com/5513906/printing-healthy-cells-onto-wounded-flesh

2) On demand printing. HP *ought* to be buying a print-on-demand outfit like moo.com or lulu.com for the same reason that Apple got into retail. To turn it into a showcase for their products; to learn more about the customer; to grow the brand into an amazing "experience". (Moo is a wonderful experience company. I love them.) Not to mention, this hedges against the possibility that people start to move away from owning their own printer to using POD.

3) What do businesses *use* print for these days? Reports? Charts? Business letters? It's a good bet that at least some reports and charts and presentations are going to move to dashboards on the iPad and similar tablets. Perhaps a printer company should think of itself as a report / charting company, providing software to support this etc.