This seems like it's going about solving mobile UI problems backwards.<p>I think a better approach would be to fill in the gaps between what a graphic designer is used to (Photoshop, Illustrator, Fireworks), and the UI tools that the different platforms offer - Interface Builder and the XML Layout editor for Android.<p>Interface Builder is definitely visual enough for designers, but most of the "cool" effects for modern iOS apps can't be done purely through Interface Builder.<p>The Android Layout Editor in Eclipse has a lot more control over features, but I wouldn't expect graphic designers to start creating drawables in XML either.<p>My thoughts would be to work within the Photoshop ecosystem - a plugin that exported XIBs and Layout XML would probably be the easiest way to go.