Here are some of the things you can do with it:
- Use the pencil to scribble some drawings or thoughts.
- Highlight areas of the page.
- If you make a mistake, click the eraser and clean up.
- And, most awesomly, edit text live on web pages.
- Add sticky notes to call out thoughts. As many as you’d like!
As much as I like the idea, I do wish it were available for other browsers. This could be the killer app for tablets. I also think PDF output would be useful.