More infrastructure than dev, but If you manage to reach the Sage level in Hurricane Electric's free online IPV6 certification program, they send you a T-Shirt:

More infrastructure than dev, but If you manage to reach the Sage level in Hurricane Electric's free online IPV6 certification program, they send you a T-Shirt: http://blog.he.net/2010/05/28/hurricane-electric-would-like-to-send-you-a-free-t-shirt/ http://blog.he.net/2010/05/28/hurricane-electric-would-like-... Warning: It is a time consuming course! I proudly wear mine, though it's getting a bit ragged now