Over at Gene Expression Classic there has been discussion of a new paper elucidating exactly how blind cavefish become depigmented. Please read the comments, as there's a lot of good discussion on evolutionary genetic parameters....
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The lower Congo river is deep and complex, and there are a surprising number of hydrologic features that act as barriers separating populations of fish — this very nice video explains the diversity of species and the ongoing evolution of the fish in this environment.
Most ancient case of tuberculosis found in 500,000-year-old human; points to modern health issues:
The "domestic" cat, Felis silvestris catus, has been with us for nearly 10,000 years.
A few months ago I reviewed a paper which examined the various complexities of interpreting signals of natural selection from recently developed genomic tests in response to the avalanche of human sequence data.