Usability 
The Associated Press, US wire service and supplier of stories to most online news sites, has its own mobile site.
AP seems to making a serious effort to compete with mobile news market leaders like Yahoo, BBC, CNN, The New York Times and Google, most of which are also AP customers.
The portal's design is similar to other mobile news sites, a front page of about a dozen headlines grouped under section headers like U.S. News, World News, Local News... The unique feature of the site is it's local coverage. The AP is a cooperative of over 1700 local newspapers which should make it a good source of local news. You can customize the mobile site's front page to display local news headlines for one or multiple US zipcodes. You choices are saved with a cookie, there's no need (and no way) to log on.
Mobile News Network comes in a regular mobile version and a special iPhone one. Browser detection is used to deliver the iPhone edition only to iPhones, which is too bad as their are other mobile browsers like Opera and WebKit that could easily display the iPhone sites's content except for the videos. The regular site has a very plain appearance with a minimum of formatting and no photos on the front page. More effort seems to have gone into the iPhone variant which has typical iPhone chrome and a thumbnail image for each headline. iPhone users also get videos in full 480x320 iPhone resolution and the ability to customize the homepage by hiding sections. Other than the videos, the news content seems to be identical in both versions.