I was having a discussion the other day about how species change over time. It's interesting how ingrained is the idea that evolution has to 'go' somewhere, that evolution equals progress toward a predetermined goal or an ideal.
Evolution is actually a neutral term. Evolution responds to the environmental pressures of the moment, pressure that can change direction or be reversed. New strains or species are 'better' than the old in the limited sense of being better adapted to succeed in the conditions they've been selected for. To say a species is 'more evolved' literally means it has gone through more reproductive cycles under the influence of selective pressure.
So to people who stand aghast to think humans descended from apes (apes, eww)(whaddya mean eww? we're still apes!), think of this: our closest relatives the chimpanzees are more evolved than we are. Yes, really. From the point at which our branches diverged, they have gone through more generations (because humans become sexually mature later in life), and to show for it they have more changes in their DNA than we do. We have gone a different route, and we have different lives as a result, but don't say we're more evolved.
Bacteria: now those suckers are evolved!