Google wave
From RevTK
Google wave is a "a personal communication and collaboration tool", currently invite only. The collaborative nature of Google Wave makes it ideal for language learners.
Japanese Waves
Japanese language waves can be found by searching:
with:public lang:ja
The Kanji Koohii Wave
A public wave for discussion of Remembering the Kanji has been created, you must be signed into google wave. [1]
Wave robots
A number of wave robots have been created for learners of Japanese.
