In the current issue of Science the International society for stem cell research is bringing guidelines for research in Human ES celss. This articles covers some major principles hat was brought together by several of the main investigators in this area all over the world.
It is a very interestin article.

Science 2 February 2007:
Vol. 315. no. 5812, pp. 603 - 604
DOI: 10.1126/science.1139337

Guy