Love it. This is our worst (Victoria, BC Canada)

This is rather more than groove, actually. I use groove at work, and while it's nice, it doesn't allow the kind of real-time collaboration on documents that wave will. Both people can be editing a document simultaneously, and both see the changes each other is making appear in the doc in real-ish time (if the demo can be believed, It'll be interesting to see how high latency links play with this).

That aspect is what excites me about this tech. It's been done before (as a plugin for word, even), but not in such an accessible way.

This is exactly what client certs were invented for. Using https with client & server certs allows the client to authenticate the server, and vice versa. It would be pretty easy for Nintendo to issue a cert for every Wii.

The only issue might be the extra CPU involved in using SSL, but if they're going to be preventing loss of revenue I can see the accountants springing for the extra hardware :)