Autodesk SketchBook Mobile for IPhone
Autodesk has released SketchBook Mobile for IPhone and IPod Touch with a very low price of around $2.99 only.

SketchBook Mobile for iPhone and iPod touch offers a combination of digital pencils, pens, markers and airbrushes, as well as an artist-friendly, gesture-based user interface, which enables users, those with nimble fingers at least, to create everything from quick sketches to print-quality production artwork.
SketchBook Pro comes with 25 preset brushes and customisable brush settings, customisable colour swatches and a colour wheel with RGB sliders provide a virtually unlimited palette and adds the ability to create images which contain up to six layers.
Content that is created in SketchBook Mobile can be saved as a picture and opened in SketchBook Pro.
"Key features in the SketchBook Mobile App include:
- Layers - Drawings can contain up to six layers.
- Brushes - The software comes with 25 preset brushes and completely customizable brush settings.
- Color selection - Customizable color swatches and a color wheel with RGB sliders provide a virtually unlimited palette.”
Autodesk has set up a YouTube channel and Flickr group to show what is possible from the mobile application.
I have tried out this application. Its different from any normal drawing application. Try it out...
This app is available in Apple iTunes App Store for $2.99.
Free version of this application is also available.