We all know Wikipedia. But... how many know that Wikipedia (and its sister projects) has a lively map making community? That community has developed many map making tools, and I believe there is great potential for cooperation between the Cartographers Guild and Wikipedia map experts. Please check the following links:

* Wikipedia WikiProject Maps
* Wikimedia Commons Map resources
* List of maps requested for Wikipedia articles

Whenever you make a map, please consider uploading it to Wikipedia. High quality maps can be nominated for featured status here, and each Featured image is put in a queue for 24h front exposure on Wikipedia Main Page - a page that gets tens of millions page views a day...