Smartphone Bits Web log breaking down the up, downs, ins and outs of the Smartphone and App Store landscapes

Windows Phone 7 + Nokia Handsets:poised to go head-to-head with Apple, Android, Blackberry and Palm

As an example of the entire marketplace, AT&T has evolved from having a walled garden approach to distributing content to mobiles to basically opening up the fortress to anyone with a store, including the forthcoming Amazon App Store.