Google has launched graphic ads for mobile devices. The mobile image ads product runs on the company’s mobile content network, hitting users with ads based on text that appears on the mobile web pages they visit. The ads are keyword-targeted, and only one ad appears per page. Without disclosing specific numbers, Google reports that early testing with click-through rates produced very good results.

Publishers can integrate the service into their AdSense accounts, while advertisers can create the ads using their AdWords accounts. The ads must link to a mobile web page. For advertisers who don’t have mobile web pages, Google hosts them.

Canada isn’t yet on the list of countries where mobile image ads are available. The company tells MiC it hopes to expand the offering to new markets in the near future. The product launched with availability in Australia, China, France, Germany, India, Ireland, Italy, Japan, the Netherlands, Russia, Spain, the UK and the US.

Yahoo and Microsoft display mobile banner ads on some mobile content.

In other mobile media news, the Mobile Marketing Association has released mobile advertising guidelines covering ad specs, preferred image formats and SMS messaging.