Earlier this week, Reuters said that Google has announced technology to provide brand images on cell phones. In other words, based on a user's query, they'll be provided with some sort of image advertisement that has been scaled to fit on the screen of a mobile phone.
The ads work on a CPC basis and must link to a mobile-phone optimized website, according to the article. They are also currently available in 13 national markets (Australia, China, France, Germany, India, Ireland, Italy, Japan, Netherlands, Russia, Spain, the UK, and the United States).
Beyond the initial suspicion, people are worried that mobile ads will penetrate even further beyond web surfing. One forum member says that he is dreading the day when his phone will ring with an ad instead of with his selected ringtone. You never know.
Forum discussion continues at WebmasterWorld.