Scientists unearth world's oldest biped skeleton. More.

Of course, several earlier hominid species were most likely bipedal, but this seems to be the best proof of early bipedalism so far - at least according to the team that found the new skeleton. I have to admit though, that the quickness of the announcement of the finding surprises me. A scientific description is unlikely to come quickly, as the whole remains of the skeleton are yet to be excavated.