Can pre-school children be depressed?

I have been working on a report of the 6 most dangerous trends facing our children today.  One of the most stunning pieces of research I have come across is that the fasting growing age groups for depression are pre-schoolers.  Then last week this article came out in the NY Times.  Here is the link to the article.

http://www.nytimes.com/2010/08/29/magazine/29preschool-t.html?_r=1&emc=eta1

In the coming weeks I will be ready to present the findings of the work I have been doing to parent groups.  Depression is just one of the trends that have surprised me.  This report will include not just the problems but some of the solutions too.