A few of the recent pieces I've liked (or, in the case of the first item, found horribly disturbing but important):
Maryn McKenna at Superbug: Ringing the Warning Bell: Colistin-Resistant Klebsiella
J. Malcolm Garcia in Guernica: Smoke Screen ("In Afghanistan, the U.S. military disposes of garbage--computers, motorbikes, TVs, shoes, even human feces--in open burn pits. Are toxic clouds from these sites making everyone sick?" Bonus: Celeste is quoted in the article.)
The New York Times' Room for Debate: Could Farms Survive Without Illegal Labor?
Helen Branswell at the Pulitzer Center on Crisis Reporting: A Mystery in the Sewers (part of the Sewage Science: Stalking a Threat to Polio Eradication in the World's Sewers project)
Scicurious at Neurotic Physiology: And then the smokers came for your sperm ...