I've just become co-chair of a new LinkedIn Group for professionals working in global health, called Global Public Health.
I suspect the summer will be quiet but we'll ramp up in a month or two and use this group as a way to tell each other about interesting news and events and to stay in touch in general.
If you'd like to join us, please do! Here's a link: http://www.linkedin.com/e/gis/120372/28CBE05C8ACF