I’ve heard about pay per play a service similar to adsense but on an audio based advertising. You place a code unto your site and your site will then display an audio ads to be played per unique visitor to your page. According to Wall Street Journal article quoted

Starting Feb. 1, San Diego-based V2P Communications is offering five-to-eight-second audio ads, called NetAudioAds, that will automatically play when a visitor lands on a blog or Web site. Publishers sign up for the free service and V2P then lines up advertisers, who bid on rates they will pay to have their ads played on a given blog. Bids generally start around $14 per 1,000 plays. Blog publishers get a 25% cut of the ad revenue.

This basically an additional income generating system to your site. The question is how far, they can survive in this fast emerging advertising industry that as far most dominated by Google? That I am sure will also be implemented by Google and other advertising Media at a later time.

My thoughts would be the number of advertisers that will be using their site versus the number of publishers they are at now. On focus point about audio or sound device has been turned off on visitors machine, visitors don’t have to click to hear the audio (good for publishers, but not enough for advertisers).

You can check the test code below. You will hear an audio, not an actual ads yet. Sorry for my visitors if you will hear a sound not pleasing with your ear.