theberf writes "On June 6, 2006 the experimental IPv6 network, the 6bone, will be shut down. All 3FFE:: addresses will revert to the IANA and should no longer be used. All IPv6 traffic should now be using production IPv6 addresses delegated by Regional Internet Registries. The 6Bone has been in operation for 10 years." Here's some more information about "IPv6 day."