You might not realize it, but Gmail has a list-centric tasks function waiting to be used. From your Android device, an app called Tasks lets you enjoy it in style, providing easy-to-manage lists to keep your to-do items organized. You can set due dates and reminders and check off tasks as they're completed.
Tasks has a minimalist user interface that fits seamlessly into the Android 4.x aesthetic. It includes both home and lock screen widgets, and it syncs continually and automatically with Google's own back end, so your data is always up to date and available regardless of what device or computer you're using.
Tasks costs 99 cents; a free ad-supported version is also available.