Following last month’s launch of its online music service in Japan, Napster has launched its mobile music service: its mobile OTA song and ringtone service is now available on DoCoMo’s iMode mobile internet service. The new service is available for approximately $3 per month. Also, along with the online music service (which it launched with Tower Records), using a compatible DoCoMo handset, users with Napster To Go portable subscription service can transfer their music from their PC directly to their mobile phone.
Some more info in the release here.