I'm all for stem cell research using the alternative sources you cited, but the problem is that whenever the 'Pro-embryonic' side pleads their case they lump all Stem Cell research into the same basket, they don't delineate between embryonic, umbilical, or adult.
Turning the argument into of 'For or against stem cell research', and Not 'for or against Embryonic-Stem cell research'
and since the Pro-Choice people, the Media, and the embryonic stem cell people are all on the same side its hard to get the facts out about the benefits of only umbilical or adult Cells.
One other problem, is that they also claim that 'Snow-flake' Embryos (the IVF leftovers put on Ice) also referred to as "Existing Stem Cell Lines" are less productive. and they wish to generate new embryos solely for the purpose of testing and research.
Another issue is that the Missouri Legislation that Michael J. Fox was hyping during the 06 elections, actually opens the door to Cloning experimentation.