Many readers may be aware of the recent paper (in Journal of Biogeography no less) by Grehan and Schwartz claiming that there is sufficient morphological evidence to support the claim that orangutans are our closest living relatives, while simultaneously dismissing all of the genetic evidence for chimps being the closest living relative. John Hawks offers a succinct reply, one which is supported by my (admittedly rushed) reading of the paper.
Ref: John R. Grehan & Jeffrey H. Schwartz. Evolution of the second orangutan: phylogeny and biogeography of hominid origins. Journal of Biogeography, 2009 DOI: 10.1111/j.1365-2699.2009.02141.x
Update (6/30): The paper is available online here.