Online vector graphics editor - SVG editor

You can download SVG-editor for free from
http://code.google.com/p/svg-edit/
You just need to copy the download folder to your web server and run svg-editor.html.
You can have free-hand drawing, lines, polylines, ellipses, square and much more features online.

One of the website used SVG editor for clipart is: http://www.clker.com/
I do find a lot of nice drawings there using SVG editor.

SVG editor demo can be found below as embed: