Microsoft Office One Note is Awesome, especially the 2010 version.
It looks a bit childish with it's colorful template, but it works really well.
You can organize a large amount of information and your to do lists in one software and in one place.
It makes a great to place to store ideas or to do lists.
It even has the ability to password protect sections, which is great for storing passwords or sensitive information.
Also the security is pretty good and not easy to break.
I would highly recommend!