I first read about this tool over on TechCrunch and noted it down. I just tried it and have to say "wow".
Project Management can be hard but this tool makes communicating it super easy. Even better, the project manager can publish it online (with password protection for easier review)
It's certainly not as powerful as MS Project but many times too much time is spent filling in details that are never used when the most important part of handling a project is communicating where it's at.
Project files are stored on your own computer so you still have control over them but you can publish it, export it as a Project file or even just as an image.
The file format is simply a text file with details (this might be the beginning of a nice open standard project format)
This is a great online tool to do just that.