iRadioapp.com is a web based application designed for use on the Apple iPhone and iPod Touch, but available through any web browser. It uses radio station listings from Yes.com and returns live information about currently playing and recently played songs for the top 30 US radio markets. Once you have found your station you can drill down to a specific song, you have the option of emailing the song information, looking up the song in the iTunes Music Store, reading the lyrics, or playing the song (this feature is only available over WiFi.) Clicking the play song link will stream a copy of the song. This feature is dependent on if the song is available or not. Clicking the play song link initiates a web search using seeqpod.com and if found, the song is streamed and played.

Seeqpod.com is worth a closer look. It is basically a playable media search tool. It allows you to create an account and you can create playlists from your searches. An interesting way to find audio and video media...

From their web site:
We are passionate about search and discovery algorithms and believe that one day, everything on the Web will need to be 'playable'. So, we decided to apply some very sophisticated technology to 'Playable Search' so that anyone, anywhere can mine the deepest crevices and corners of the Web for media that is publicly available, yet it is not always so easy to find...

By way of Fabric of Folly...