Stem cells will be debated in Congress again this week...

...and here's a good article detailing he ethical issues:

The president's refusal to ban privately-funded embryonic stem cell research is not the only way in which his policies betray the principle that embryos are persons. In the course of treating infertility, American fertility clinics routinely discard thousands of human embryos. The bill now before the Senate would fund stem cell research only on these excess embryos, which are already bound for destruction. (This is also the position taken by former governor Mitt Romney, who supports stem cell research on embryos left over from fertility clinics.) Although Bush would ban the use of such embryos in federally funded research, he has not called for legislation to ban the creation and destruction of embryos by fertility clinics.

"Read the whole thing!"