WordDraw plugin foe WordPress by burzak enables you and your visitors to draw comments. Frst beta release.
Tools:
Pencil
Pen
Path
Paint bucket
Eraser
Marquee
Image
Text
Rectangle and ellipse primitives
Undo and redo
To enable canvas checking box ‘Allow drawings’ on ‘Edit Post’.
Download and info: http://wordpress.org/extend/plugins/worddraw/