Astrid has been one of the most popular To-Do list apps for Android for years. Today it's getting a facelift and a few extra features. Most notably, Astrid now has a spiffy tablet UI. Making use of the Fragments API, Astrid lays out your Lists panel, your individual tasks, and details on each individual task for easy access. Like so:
Simple, straightforward, and easy. The new UI is being added to more than just tablets, though.