"Attention regulation and monitoring in meditation" (PDF). A recent article in Trends in Cognitive Sciences on the neuroscience of meditation, focusing on how meditation alters and sharpens the brain's attention systems. The research is being done at the Waisman Laboratory for Brain Imaging and Behavior (previously), who have also recently published research on the "Regulation of the neural circuitry of emotion by compassion meditation" (PDF), which describes how meditation can cultivate compassion by physically affecting brain regions that play a role in empathy. They shared this research with the Dalai Lama at the recent Seeds of Compassion forum.
Searching for God in the Brain. "Researchers are unearthing the roots of religious feeling in the neural commotion that accompanies the spiritual epiphanies of nuns, Buddhists and other people of faith." [Via MindHacks, which points out a few niggling omissions in the article.]
Meditation found to increase brain size (maybe) according to research led by Harvard neuroscientist Sara Lazar. Meanwhile, Atheist Manifesto author Sam Harris recently went on a meditation retreat and seemed to find it pleasant enough.