Annotatable Schematic of the Arduino Uno

WARNING: position and resize note first,
then save then go back and add text. Note collision detection is
currently server-side and this prevents text loss on error or simultaneous
edit.
When writing comments, remember: why is most important,
followed by how. What is usually redundant and useless and
in this case is covered by the title for the element (e.g. Pull-up Resistor).

Source for this page is available here.
It consists largely of a hacked version of this.
You are welcome to use it for other things.

Enjoy!