Here are some articles - mostly published in May - that I found particularly interesting: 

Angevaren, M., G. Aufdemkampe, et al. (2008). "Physical activity and enhanced fitness to improve cognitive function in older people without known cognitive impairment." Cochrane Database Syst Rev(2): CD005381.  [...

I described the work of UK's National Institute for Health and Clinical Excellence (NICE) in an earlier blog.  At the end of May they issued a helpful guideline on "Promoting physical activity in the workplace".  NICE point out that "Increasing physical activity...

There was an interesting study of over 12,000 people published in the New England Journal of Medicine recently (Christakis and Fowler, 2008) looking at the way that stopping smoking seems to help those around us stop smoking as well.  So if I stop, the chances of my spouse smoking decrease by 67%, of a friend smoking decrease by 36%, of a co-worker (in a small firm) by 34%, and of a sibling...