A team based at the National Taiwan University in Taipei has used a combination of inkjet and screen printing to make small resistive RAM memory cells on paper. These are the first paper-based, nonvolatile memory devices, the team says (nonvolatile means that the device saves its data even when it's powered down).
As Andrew Steckl outlined in his feature for IEEE Spectrum last year, paper has a lot of potential as a flexible material for printed electronics. The material is less expensive than other flexible materials, such as plastic. It boasts natural wicking properties that can be used to draw fluids into sensors. And it can be easily disposed of by shredding or burning.