Has anybody tried Raziko yet?
https://market.android.com/details?id=co...atu.radiko

I find the app pretty cool. Though I can only understand small fraction of the real live speech.

Hey,

Check out http://forum.koohii.com/showthread.php?tid=4993&page=4
I posted a little review of Raziko here.

There is to add: It is possible to receive Japanese streams with TuneIn as well.
The trick is to go via "Location -> Asia -> Japan" and not "Language -> Japanese". Then there are plenty of streams.

I can't say which is better of them.
Raziko has a program schedule and often playlists. TuneIn has even more streams. Both do have a Sleep Timer.

Go for it. Do listen to Japanese, even if you don't understand. Time is on your side I started listening just a few days ago, and I can say, if you listen mindfully you will make progress in understanding.