One of the most obvious trends I observed at the World Mobile Congress were startups that are beginning to interweave entertainment like TV and games with mobile social networking themes. One company I met that I think have a really standout solution is Ammeon.

Ammeon is a privately held startup that provides of mobile broadcast, multicast, interactive services and communities. Based in Ireland and privately funded, the company has a product Commune which is a complete social broadcast/multicast platform, combining interactive mobile TV with social networking. The Ammeon solution provides a space where communities can watch exclusive scheduled TV content, upload their own video contributions, chat with friends, interact with competitions and polls and purchase related content.

Their suite also include:
Commune Studio , a Web-based user interface that provides a community management set of tools for creating, managing and scheduling content, with simple drag and drop capabilities to create nice interactive layouts;
Commune InterAct - enables the delivery of interactive mobile communities or "community channel spaces". Users can subscribe to a number of community spaces based on community themes. These spaces contain professional and user-generated content with members enabled to upload their own content and own their own channel.

The client from my recollection is built in Java/J2ME - however companies like this will have a strong value proposition to Microsoft if they embrace Silverlight for mobile in the future. This will enable them to continue delivering their current applications and value cross plaform and be a Microsoft strategic partner. Check out more information about this company at http://www.ammeon.com