Official PSP Internet Radio is good but it relies on the stations that are obtained via searching the shoutcast or icecast directory. And the search word is the genre you chose. It is obvious that if you have you favourite station, like I do, you might never be able to load it up.
So I made this stripped down version that has 5 presets, which you can change. The only setback is that you can't really permanently save your own streams unless you edit the script file, which is javascript and very easy to edit.
Screenshot:
Download: (the installation instructions are in README.txt)
You have to have official 3.80 firmware and the official PSP internet radio player installed and activated