I'm trying to find a good iPad app that will let me do some linework and export it to email or flickr or whatever. It doesn't have to be amazingly complex, because the linework itself will get thrown into Photoshop, where I will do the coloring/shading/blending. I know it's probably not what most people use, but I've not the money at the moment to buy a USB drawing pad (though it's very high on my list). I also don't have a scanned, so drawing on paper isn't an option either. The app would only be used for a short while, but the linework is kind of what my current map is stuck on. Any advice would be greatly appreciated.

To give some idea, the stuff I would make with it are things like border decorations, map icons such as towns, cities, ships. All pretty simple stuff, but I just can't do it with a mouse.