What is BackPackIt? Well, here's the original definition from the site:
Backpack is a simple web-based service that allows you to make pages with to-do lists, notes, files, and images. Backpack also features a Calendar and Reminders that can be sent via email or to your cell phone at predefined times.
In short, by using this services, you will be able to share your ideas, todo list, notes, and many more. You can do lots of things with this services. And since it can be configured to be publicly accessible by other people, people can also give their suggestions or even remind you if they notify that you had something to do today. Nice isn't it?