According to Lev Grossman writing in Time magazine (21 Feb 2011):
In (Ray) Kurzweil’s (futurist, technologist, and transhumanist) future (after the singularity or moment when technological change becomes so rapid it represents a rupture in the fabric of human history, approximate date 2045), biotechnology and nanotechnology give us the power to manipulate our bodies and the world around us at will, at the molecular level. Progress hyperaccelerates, and every hour brings a century’s worth of scientific break-throughs. We ditch Darwin and take charge of our own evolution. The human genome becomes just so much code to be bug-tested and optimized and, if necessary, rewritten. Indefinite life extension becomes a reality; people die only if they choose to. Death loses its sting once and for all.
We can scan our consciousnesses into computers and enter a vitual existence or swap our bodies for immortal robots and light out for the edges as space as intergalactic godlings. Within a matter of centuries, human intelligence will have re-engineered and saturated all the matter in the universe. This is, Kurzweil believes, our destiny as a species.