2009 Complete Primate Skeleton from the Middle Eocene of Messel in Germany: Morphology and Paleobiology. PLoS ONE 4(5): e5723. doi:10.1371/journal.pone.0005723
Some of the popular press have started raving about this as the "missing link" and claiming it's related to the human lineage, but that is all deceptive. This is a very early primate, about 47 million years old, and weighed less than 1 kilo, hardly what we think of as the missing link. Nevertheless, it is an important discovery.