I clicked away when I saw the logo of Uncle Sam - that image references both a call to war and a US bias. Just wanted to point out my response, but other than that good luck with the project.
If you'd stuck around you might have noticed that the project is, essentially, European. The main contributers all live there, they receive funding through Eurostars, and I don't remember any of their gatherings/sprints being held outside of Europe.
In the future you might want to watch that knee-jerk reaction, it can put your foot right in your mouth.
Given the history and imagery of "Uncle Sam", it becoming the equivalent of a genericized trademark cracks me up and makes me marvel at the longevity of a well crafted marketing shtick.
The use of the image has remained culturally strong because of the many brilliant satirical treatments it has received, not because it is a powerful signifier calling for people to work together.
EDIT: much cooler link http://www.artlebedev.com/mandership/154/