I missed this while I was running a beta teach last week. The Mozilla Foundation is working on a open source standards based mobile operating system. They offered free sample phones to developers at the JSConf in Scottsdale, AZ.
All apps are built using HTML5 and CSS3. This could be very interesting if the project continues to gain some momentum. Articles follow.
TechCrunch: Free Gecko Smartphone at JSConf
Applico: Mozilla Mobile Operating System Sneak Peak
Mozilla Boot to Gecko Announcement