When you first launch No.2 on your iPhone or iPod Touch, this is the screen you see. The built in documentation will lead you through 5 pages of simple instructions.

Like other iPhone software, you can scroll around the page with one finger, or use two fingers to zoom in or out with pinch gestures.

Here, the only new thing to learn is how to control the pencil, and it is super easy. Use one finger to move the pencil around. You can see from the shadow that the pencil is floating above the page, so it isn't drawing anything yet. You'll learn how to draw next.

But first we need to know how to get to the other instructions. To close a drawing or page in No.2, you tap on the book icon in the lower right corner. All of your drawings are stored in books, so this icon means "show me the whole book" instead of just this one page.

After tapping on the book icon, the page zooms out to show the current book. The pages are in the order you created them. What you see here is the "Documentation" book that is included in No.2.

When you are looking at the contents of a book, you can scroll up and down (if there are more than 9 pages, you'll have to) or tap on a page to open it. Tap on the "New Page" thumbnail at the end of every book to create a new blank page.

We've already seen the "Welcome" page, and we want to learn how to draw, so we tap on the "Drawing" page to open it.

Now we are ready to start drawing. While a finger is on the pencil (which we need to move it), just tap with a second finger to start or stop drawing. It could be any finger, on the same hand you are using to touch the pencil, or a finger on your other hand. Just tap with a second finger and the pencil will tilt down to touch the paper. Tap again to lift the pencil away from the paper.

The pencil will tilt so that the tip does not move. This way you can position the pencil exactly where you want to start drawing, and then lower it to touch the page. Also, the pencil will not draw while you are scrolling or dragging the page; so you can also carefully position the paper under the pencil, and then start to draw.

But you still might make mistakes. You can always erase your mistakes (we'll see that on the next page), but since you are using a computer you can also just undo the last thing you drew. Tap the arrow in the bottom left corner to undo, or if you change your mind, tap the arrow again to redo the drawing.

But what if undo isn't good enough. Maybe you draw a line and you only want to erase part of it? That's why pencils have erasers on the back.

Just tap once on the pencil to flip it around and use the eraser. When the eraser is on top (or in front), you use it just like the pencil tip. Move the pencil around with one finger, then tap with a second finger to lower the eraser to the paper and erase.

If neither undo, nor the eraser are good enough, you can also just delete the whole page. Tap on the trash-can icon in the bottom toolbar to throw the whole page away. The software will ask you if you are sure before deleting it and returning to the book.

It is that simple to draw and erase, but what can we do with these drawings? There are a lot of possibilities, but we'll start by exporting the drawing to your Photos. The Photos application is included on every iPhone and iPod Touch, and includes a roll of saved images.

Just tap on the camera icon in the bottom tool bar to "take a picture" of your drawing. If you quit No.2 and open your Photos, you'll see it there in your saved photos. From there you can attach it to an email, assign it to a contact, or set it as a wallpaper. Also, when you sync with a desktop/laptop computer, you can upload your drawings just like they were new photos taken with a camera (this does work on an iPod Touch even though it doesn't have a camera!)

A final tip: tap once on the paper to hide/show the toolbar at the bottom.

And finally, we look into the future!

We have a lot more planned for No.2 in the coming months. We've been using it for a couple months now and know some features we want: changing the size of a page (right now they are twice the width and height of the screen), changing the angle of the page, selecting parts of a drawing to move or copy, copying selections from one page to another, etc.

We also plan to add more tools than just a pencil: pens, crayons (color!), markers, rulers, stencils (for lettering and shapes), and much more.

Please send us an email and let us know what new features are most important to you!