Stuart Newman and Jeremy Rifkin have submitted a patent to the U.S. Patent and Trademark Office for the technique to produce a "humouse" - a human-mouse hybrid. The technique would involve injecting the embryo of one species with the cells from an embryo of the other species, resulting in a critter with cells from both species spread throughout, working cooperatively.
Don't get too excited, furries - their purpose is not to actually create a humouse, but to force limits on the patenting of human life. I honestly can't say whether this would be a good thing or a bad thing for us - on one hand, if furries are to be created, I wouldn't want them to be created as products or slaves, but without the ability to profit, companies are likely to not expend the resources to create them at all!