Nice work! I was thinking on implementing some cool features on a drawing site I created. I tried to avoid HTML5 canvas to keep compatibility with older browsers (solved with some javascript + image creation workaround). But when I see this kind of apps like yours, makes me wonder if I should forget about compatibility and provide users with better features.

Is there a way to express the depth of the cursor in the drawing? If I draw a circle on the left side of the canvas, I cant figure out how to draw a line through its center.

Cool app, but how exactly is it 3D?

Actually I can't figure that out either, but my PC seems to be too slow to use this app in a normal way. Gonna try tomorrow at work...

"To rotate the canvas in 3D, you need to hold down SPACE and then DRAG horizontally with your cursor."

Move your cursor over the heading so you get a little help (not really intuitive, but I liked it once I found it)

Oh, very cool. This just got a bunch more fun.