This is the killer app for tablets

Handwritten, drawn, and typed notes with symbols together on a page. Movable, scalable and zoomable. You can fit an enormous amount on a page and have multiple pages. Its really a layered vector based editor, but so easy you might never realize it. Also imports pictures.

You could fit a mind map style set of notes on a single page, and have multiple pages. Its like having a huge editable whiteboard in your hand, and you can export and share it, or print it.

You could also import a document image, hand-sign and send as PDF.

At the same time, you could design vectored logos or create art that looks hand drawn or almost painted because you can layer with opacity.

This app should be hugely popular, ranging from just-start-marking to much more, without having to mess with many options. This is what I wanted an iPad for, and it works on iPhone.

Bryan3000000 about Pen and Paper