We have three buttons available: Brown, Orange, and userbar.
You can see the recipe on how to put it in a webpage here.
Learn more about UDW in this brochure.
Individually: Every Ubuntu spreader should, directly or indirectly, put at least 4 UDW buttons in a public website.
Globally: Everyone puts at least 1000 such web site buttons making the Ubuntu Developer Week a notable event!