IGN reports that Taito has begun offering a Karaoke download service for your PSP provided through P-TV. The service lets users download karaoke videos to the PSP for 105 yen a song, which can then be viewed for up to 15 days. Downloads can be made from any wireless LAN spot.
However, since the PSP lacks a microphone, this is not a “full” Karaoke service. Instead, Taito expects people to use the clips to memorize the songs and then sing either at home or Karaoke bars.
Currently the service only has a few J-Pop songs but hopes to expand the library as the popularity increases. Considering that Karaoke is HUGE in Japan, I see this service taking off. I doubt it will make it’s way overseas, but anything can happen.