TheBrain: Organize and Find Everything the Way You Think (youtube.com)
TheBrain lets you organize all your ideas and information the way you think. You can download a free version at http://www.thebrain.com

TheBrain moves beyond linear folders and lists. You don't have to force any idea or project into a single folder. With TheBrain you can connect things to anything else. And there's no limit to the amount of stuff you can add to your Brain. You can literally create your digital memory for anything and everything. As your Brain grows you can find and discover the important details that would otherwise be forgotten. Your Brain can also be synchronized across multiple machines and accessed on the cloud.

Download now at http://www.thebrain.com