And, the longer I've been on, the more people have joined in, and the more people that have joined, the more issues wave seems to have.
All that to say that if you'd like to be invited to a rather buggy beta preview of something that can be completely pointless or fairly useful, leave a comment. I have two invites that I'll give out at random sometime in the coming week. Be aware though that it takes a bit for the invite to be processed by Google.
EDIT: Closed to Comments as of 11/17.