This is a cool overview article on the complexity of chimpanzee social and cognitive behavior. One of the more interesting points is that chimpanzees are able to outperform humans in some memory tests, about recalling series of numbers, which might suggest that a trade-off for language is immediate memory.
They also talk about tool use and empathy, such as for Knuckles the chimp with cerebral palsy (above) who is treated with consideration even by the high-ranking males of his social group.
http://www.nytimes.com/2007/04/17/science/17chimp.html?pagewanted=1&_r=2
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