Did a quick search, didn't see anything about grooveshark this month.
Link: http://www.storenvy.com/products/72750-japan-relief-year-gsa
$20 for a year of Grooveshark Anywhere, which sound pretty awesome to me. I
think it's normally $9/month. The iPhone app was revoked by Apple, but if
you are jailbroken there is an official Cydia app.
Help Japan and get Grooveshark as an added bonus.