Well, it looks like I just spotted a bug in the new layout. Our show notes appear to be losing formatting. I'll get he web guys to look in to it in the morning, but until then, here are my notes that I mentioned:
Teredo Tunnel Overview
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http://technet.microsoft.com/en-us/library/bb457011.aspx
Steps to Enable Teredo Tunneling
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1) Point your Teredo client to Microsoft's public Teredo proxy:
netsh interface ipv6 set teredo client teredo.ipv6.microsoft.com
2) Enable Teredo for domain systems:
netsh interface ipv6 set teredo enterpriseclient
3) Verify Teredo config
netsh int ipv6 show teredo
4) Create default route
route print (Get ID of Teredo interface)
netsh interface ipv6 add route ::/0 interface=58