Currently stem cell useage requires the embryo be destroyed, which is why it is termed unethical in the puritan United States.

Professor Robert Lanza, medical director of Advanced Cell Technology (ACT) in Massachusetts, US, and lead author on the paper, said: “We have shown for the first time you can create human embryonic stem cells without destroying the embryo and thus without destroying its potential for life.”

This is done by removing single cells from the embryo.

There’s some controversy about how Professor Lanza conducted his research to find this out and he claims the baby is undamaged, but I have no idea how redundant cells are in the emryonic stage.
At least something is being done to allow cancer sufferers the hope of research in this line of medical science from US clinics.