At the moment I have 13 drawing, painting sketching apps on my iPod Touch.
- Alias SketchBook Mobile - The best for my needs. A nice simple interface that gets out of the way. Not perfect but a good starting point. It tries to emulate a few natural media tools; pencil, marker, brush, airbrush.
- Brushes - a simple painting program. Feels like a vector based Flash painting program.
- Inspire - The closest thing to Ambient Design's Artrage on the iPhone, but be warned it has the most god awful 'start-up' screen i have ever scene on an iphone app.
- Eastern Drawing - very blobby dynamically varied line weights. Kind of like an overly loaded chinese caligraphy brush, but not really. :-)
- SketchPad - very useful simple straight up doodle pad. Not for painting or rendering
- Inkiness - similar to SketchPad, nicer superficial treatment. The Moleskine look is cute, but functionally its lacking. I don't see a way to zoom in or out, pretty much a required for a drawing/painting app on such a small screen. But still fun and interesting... i'm undecided about the visual/virtual fountain pen you draw with... i'm not liking it. Someone makes a drawing app that offers a virtual pencil as well, but that looks even more awkward.
- Renoir - Similar to Brushes it attempts to mimic a paint brush and other 'natural media' tools. Very image.
- Colors - very much like a Flash based painting app. Apparently vector based.
- Layers - a 'natural media' paint programs. Visible hairy brush strokes. Probably the best user interface, along with Alias Sketchbook Mobile.
- Petit Peinture - the interface is VERY OLD SCHOOL CGI. Seriously. If you used graphics systems in the late 1980s this might have a very nostalgic feel for you. One thing it has that i do like is a blurring tool, similar to Photoshop's, called Cloud, that you can use to selectively give parts (or all) your drawing a softer, almost water color feel.
- Doodle Swakker - this apps big selling point is that it has an online social component, "draw with friends." a great idea. Otherwise it, like Colors, very much like a Flash based painting app. Apparently vector based.
- VanGo Photo - like Colors, very much like a Flash based painting app. Apparently vector based.
- Photoshop mobile - super duper limited version of Photoshop. Not a drawing or painting app, just a photo cropping rotating tool, really. Useless for my needs... one day it might prove itself useful, but for now i have no idea what to do with it.
- Animations - isn't a drawing or painting program per se, but an animation program. I have yet to give it a shot. It sits there collecting pixel dust begging for me to use it.
- Musophobia - not a drawing program, more of a digital Spirograph or Spin Art app. Nice for zoning out.