Let's Wave [Google]

What's Google Wave?  I don't know.  I can't explain it whenever I tell someone and they ask me 'what's special about it?'  Luckily this video does a pretty good job, but it makes the good point that what the Wave preview shows now is only a fraction of what Wave is capable of when its fully released.  Thanks for Eric for sending me an invite to try it out.  Anyone else want one?