When it was first announced and went out in beta, there seemed to be a lot of enthusiasm around a number of forums about Google Wave, with some people stating it to be "the death to all other forms of electronic [text based, interactive] communication".
Now, quite a while after the initial launch, where is it now?  I've hardly heard much about it lately and don't see heaps of people jumping the bandwagon.
Some people in a team project decided to use Wave instead of emails, and I personally found that, although it was an interesting idea, I don't see how it got so much hype (then again, I'm rarely ever impressed).  In fact, I found the system downright annoying compared to emails - it wouldn't work in Opera, file attachments didn't work properly in Firefox, so I had to install Chrome in a VM to use it properly.  The fact that all conversation went in one big thread made searching through and sorting through info a pain.  I honestly would've preferred a plain old email system.

So, do you ever use Google Wave?

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I thought it got shut down. Obviously not.

I think it had some nice ideas, but ultimately, I found it too annoying to use.
A wiki/email type hybrid that it was certainly has some uses, but I think claims that were made initially were somewhat too ambitious.