Rdipithecus ramidus paleobiology and comparison with other australopithecines

What does the 4.4-million-year-old species Ardipithecus ramidus tell us about the palaeobiology of early hominids and extant African ape evolution? Compare this species to other australopithecines. Below is an example paper.
White et al., 2009. Ardipithecus ramidus and the Paleobiology of Early Hominids. Science, 326, 75-86. DOI: 10.1126/science.1175802