As most of us would now know, FW 3.80 for the PSP brought with it the functionality of an Internet Radio. In order to use it you need to download an Internet Radio Player to your memory stick.
Apparently (on the online instruction manual for the Internet Radio), Sony are planning to let us create and use our own Internet Radio Players by providing a Dev Kit that will be released on the Japan-Region site in the near future.
There you have it:)Internet radio is an Internet service that distributes audio content.
To listen to an Internet radio broadcast on a PSP* (PlayStation®Portable) system, you must first add an Internet radio player.
A developer kit for creating an Internet radio player will be provided on the Japan-region Web site. The date the kit will be made available will be announced as soon as it has been decided.