Cool language, I wish it wasn't react though. I guess there's more interactivity possible than shown in the demos; the only thing I've seen are popups for terms. Don't really need react for that.
I'll be adding an "Examples" page with more interesting content soon.
The reason for using React is that it provides a nice model for components that encapsulate state and interactivity, so a user can just write "@Component{contents}" and the component author can deal with all the tricky UI issues. A design goal for Nota is to be as declarative as possible, while still integrating nicely with Javascript.