I think this has great potential. This might be a killer app for the iPad. This seems like an excellent tool for brainstorming and journaling. This can handle a lot of the functionality shown in the Microsoft Courier ad. A website where a Javascript version can be shared and edited collaboratively would go a long way towards making this a killer app! The addition of a desktop version for Windows, OS X, and Linux (possibly based on WebKit) would seal the deal.