Seiendan 声援団, created by Inoue Kazuhiko (Kakashi's Japanese voice actor), is a growing group of seiyuu who are banding together to support the Japan Earthquake/Tsunami Relief efforts. Orikasa Fumiko, Seki Tomokazu, Paku Romi, Mitsuishi Kotono, and Yamaguchi Kappei are just some of those lending their voices to the cause now.
Uploaded 3 days ago, Kazuhiko-san leads them in song (they wrote it specifically for this), to offer support.
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Uploaded 11 hours ago, here is a more recent message from each of those involved (Japanese only):
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Even if you don't understand Japanese, it is still worthwhile to view this heartfelt message. Listen to their voices and watch their expressions. I believe their utterances of hope, courage, and "looking forward together" will come through to reach you.
日本、頑張って!