If you're looking for a simple way to keep your notes in sync across computers, Fargo is a web app that runs in any browser and syncs with Dropbox. That means you can use it to organise projects, to-do lists or as a regular old notepad.
Fargo is a text editor built for outlining ideas. The outliner function allows you to easily expand certain sections, hide them and organise it all better. Files are then saved on your Dropbox and locally as an HTML 5 file.