Smart To-Do

From Virtuoza:

With Smart To-Do improve the way you manage your everyday tasks. This application will make it easy and fun for you to keep track of your tasks and goals by going much further than the usual to-do lists go. Smart To-Do sports a convenient tabs-based interface allowing you to organize your to-do lists better. For every task you can add a long description and an attachment, which can be a file or a folder. Every task can have a reminder, which will alert you when the task is due.