This tool was pretty responsive to draw with using a tablet, and I'm glad the pen width isn't very large.

I love using a Wacom tablet for drawing diagrams, and wish there was a good shared whiteboard tool that supported pen pressure.

I didn't know if this is possible at first, but a quick search revealed http://muro.deviantart.com/, which supports pen pressure using a plugin.

Any chance you might add that kind of flair to whiteboardfox?