Babel Tower (Edmund Blair Bolles’ blog) has more about Ardi. He points out a misleading reconstruction (“whites of eyes” retroactively white instead of brown as in chimps and gorillas), a leap to conclusions about her family life, and a number of other interesting points. The one I find most interesting is
The species is not much like a chimpanzee, suggesting that chimpanzees and bonobos have evolved quite considerably since the last common ancestor with humans. We can no longer assume the last common ancestor was much like a chimpanzee in behavior or anatomy.