Caffeine content of cold-brewed coffee: higher or lower than hot-brewed?
There's an article from MSNBC which quotes the Toddy company.  The Toddy company makes a device for easy brewing cold brewed coffee.  Apparently, in a side by side test of Toddy cold brewed with Star Buck's hot brewed, the caffeine content was ~30% less in cold brewed than in hot...  I'll go with that.  http://today.msnbc.msn.com/id/5728227