More Than Human by Ramez Naam
Naam's recently published book More Than Human is a chronicle and prediction of current research and production of biotech and nantech investigations and treatments. His thesis is that not only are these inevitable developments, but they are necessary to human survival.
I haven't read his work yet, but would add that my own ideas see transhumanism as inevitable and already in motion. Not only that, I'm certain that we will look back on this time as the dawn of a golden age, in which individual humans take over their own random genetic development and apply thought and consideration to fate's previously haphazard process.
I've got to get this book -- it sounds wonderful.