I just watched Google Wave Keynote video on Google I/O and I must say I was very impressed with pretty much everything mentioned in the video, the possibilities with Google Wave are enormous.
I'd like to ask if there are any projects using Google Wave already in beta (usable stage) and I would also like to know when is Google Wave supposed to be available for the rest of us who didn't attend Google I/O.
You can request developer access to the wave sandbox at: https://services.google.com/fb/forms/wavesignupfordev/
It might take a few weeks.
As great as the technology is. It is safe to say it will only be used to find more inventive ways for us to:
Joking aside, you can signup for the sandbox (as I have) and play around with apps and robots and whatever. You can Sign up here for the developer preview and have a look at what is going on!
You could also run your own wave setup using the information here and experiment with the down-and-dirty!