> I have to wonder, too, what an
> immortal but procreating human
> species would mean to itself and the universe.
A lot of people have said something along this line. Elizabeth Moon has played with this idea quite a bit in some of her Science Fiction novels. She calls them "Rejuvenants".
<
http://www.webscription.net/W200208/0743435524.htm>
<
http://www.baen.com/chapters/W200009/0671319612.htm?blurb>
<
http://www.baen.com/chapters/W200009/0671319639.htm?blurb>