Shuffle is a personal organizer for your Android-based mobile phone. Based on the Getting Things Done methodology, Shuffle is a "dumping ground" or inbox for ideas and tasks, which can subsequently be processed into actions, organized into contexts and projects, etc.
Since Shuffle lives within your mobile phone, you have permanent access to it and you can grab every elusive thought preventing it o bother you later, and stay focused on what you really need to do.
Bonus: another related application for to-do lists in your Android-powered phone: TooDo, with very nice features, such as its two-way synchronization with Remember the milk and Toodledo.
If you want to learn more about what Android is all about, nothing better than some short videos by the developers team , like this one: