I get my best work done as I drink my two cups of Organic Assam every morning. Those first two hours are productive - spreadsheets get completed, blogs get written. I guard them jealously. And now I know why. A recent study just concluded that hot tea promotes cognitive function. They attributed it to the caffeine and theanine in hot tea tea and that the effects could be felt within minutes of finishing the beverage.
You can read more about the study here. Yet another reason why Tea should be a part of your daily regimen.