Wii Speak Channel. Chances are that, had the shocking Wii Download Ticket scare not happened, none of us would have cared much about it. After a statement from Nintendo that didn't quite answer a Edge finally got a point-blank answer from Nintendo on the subject of the eligibility of owners of used WiiSpeak mics to get Download Tickets. Good news!
"Any consumer who requires a Wii Download Ticket after purchasing a pre-owned Wii Speak Accessory may contact their local Nintendo Customer Services department, where they can request a Wii Download Ticket for the Wii Speak Channel for free."
You can't get the Channel for use with your WiiSpeak on a friend's Wii, and you can't get a Ticket for use with a third-party mic peripheral. But hey! Nintendo isn't nefariously penalizing used sales like we all assumed!