by Google Wave Blog
University students and professors worldwide have used waves within and beyond the classroom to collaborate on Latin poetry translations, write academic research papers and even build new functionality with Wave’s APIs. An ICT teacher also enjoyed having her 5th-graders do their class research in Wave. Now the Wave is open to all – no more invitations; no more waiting. Let the learning waving begin!
http://googlewave.blogspot.com/2010/05/google-wave-available-for-everyone.html