The Yahoo! mail has been updated, and it brings a lot of improvements to the app. The biggest improvement is battery life, after the update the app should use between 20 and 40 precent less. Stability has also increased, as well as the push notifications. SSL is now turned on by default, making it all more secure. The interface has also changed, bringing pull-to-refresh, slide out folders and action bars.
Download Yahoo Mail app for Android at Google Play store.