I got my Google Wave invite the other day. I'm enjoying it, but it is a little bit too quiet for me to use productively at the moment. When I get some invites myself, I'll send them out to the people who've asked for them.
What I really wanted to post about was the robot I wrote. I was quite impressed by the easy of the API, and the integration with Google App Engine, which makes writing a robot really easy to do. My robot, Twitter Wave Bot, takes #hashtags and @usernames and simply links them up to twitter. It took me about 8 hours to implement and you can see the code here:
To get this robot working, add 'email@example.com' to your google contacts, and then add it to any wave and it'll start working for you straight away.