Cascada Mobile has released Cascada TAG—which allows users of mobile content to refer that content to their friends. It’s promoted as a P2P system but it seems more like referal marketing to me…

TAG works by providing publishers and developers with a simple API that is embedded into any J2ME game or application. Once a subscriber purchases and downloads the application, he can at any time refer or recommend the application to his peers by selecting the recommend menu option embedded in the application. The TAG system then takes care of notifying the intended recipients of the recommendation and determining the version and location of the application that will be compatible with the recipient’s mobile device and carrier.

Konami Digital Entertainment has already signed up for TAG for their mobile game Frogger. Considering the fragmented nature of the mobile phone environment it will be a while before more than the simplest mobile content can be effectively distributed in a true p2p way.