JPOP One -MQ
AMA Radio -LQ
Japan Live Radio -MQ
Japan-A-Radio -HQ
Armitage's Dimension -HQ
KawaiiRadio -HQ
AnimeYume -MQ/HQ

Plenty more out there too. Live365 and Shoutcast have even more. Most are a mix of jpop/anime with some kpop/jrock/etc. too.