last week, I started working on small browser project, to help Arduino newcomers find pins and setup circuits. This is still work in progress: http://arduino-uno-schematics.divshot.io/ So far, I just wired up a SVG library and added a basic pin placement algorithm.
I am planning to improve the placement of pins, and add a board selector for Arduino Uno, Nano, Leonardo. And, to add a filter box for the pins and markers.
To understand if others would be interested in this, it would be great to hear your feedback. I have heard already that upverter does something similar to some. I am adding a link to a Github repo soon.