Will Kelly at WebWorkerDaily posted some possible uses for Google’s Wave:

http://webworkerdaily.com/2010/01/14/google-wave-whats-it-for/

Wave is Google’s answer to “online collaboration and communication,” but it’s still in active development so you can sign up and hope for an invitation or ask someone who’s already using it to invite you.

Watch Google’s video introduction for more details:

http://wave.google.com/help/wave/closed.html