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Google wave has come out of its invite only mode, now any one can join it. Visit wave.google.com and you can create an account or sign in using you Gmail account. On may 18 2010, Google announced this at Google I\O conference where they first showcased Google Wave 1 year back with a 90 min presentation.
I know a lot of people must be thinking isn’t wave dead yet still i would suggest all of you to go back and revisit it as it was in a preview mode at that time. May be you find it useful now.