Sproutliner is a free web service that helps you manage your projects and ideas (think of it as a supercharged structured to-do list).
Webnote is a tool for taking notes on your computer. It allows you to quickly write something down during a meeting, class, or any other time that you have a web browser available.
You start by creating a workspace and creating notes in the workspace. You can save your workspace at any time and return to them from the same computer or any other computer. You can also share your notes with others by providing the workspace name (or url) to a friend.