User:AlMac/Wiki Start Map
Reasonable size "summary".
Then scroll down and sideways to see the whole thing exploded. You can click on some of the images to take you to relevant places.
Lots of people have contributed information and links of great value, but there's lots more work to be done. We all can contribute to making a great service even greater. Here's the context from which I located this the [http://en.wikipedia.org/wiki/Wikipedia_talk:WikiProject_Usability#A_diagram_to_help_us diagram].