Yesterday, I got Google Wave invitation. It has asked me to fill a form. The form asked few details and also asked about the possible username I want to take. It has asked me three possible usernames and telling all three usernames was mandatory. Funny!
I got invitation on the email account I am not using for social networking. but As it is only sandbox account It will be still funny to use it for test. Currently I have no idea - How I will use it! I will share my experience about it as and when I get something.