Recently, a Girl Talk Blog (one of my faves!) did a series on dealing with emotional toddlers. The timing was good as its something we are working through at the moment. Here are several of the articles from the series, with a tidbit from each. I highly recommend reading the whole series:
How Do We Deal with Our Daughter's Emotions? - "Emotions are from God and emotions are for God. Emotions have a purpose. They are to assist and aid us in directing our whole being and our whole lives to the worship of our glorious Savior!