If you want useful stem cells, you need to get them from something other than human embryos. The embryonic stem cells are useless.
there's good news -- but the kind hearted elitists-in-favor-of-embryo-destruction warn us not to get our hopes up that they'll quit creating and killing embryos:
http://www.lifeethics.org/www.lifeethics.org/2006/07/truly-ethical-adult-to-embryonic-stem.html