Intresting technology from IBM:
What is Socializer?
Socializer is a distributed, peer-to-peer platform that connects a person to people and services in the same location. The platform is bundled with the following applications:

Chat: Allows chatting with discovered users

File Transfer: Allows users to send files

Profile Manager: Enables users to create profiles and exchange persona information with others. The information can travel across multiple degrees of separation. Incoming profiles can be filtered based upon pre-defined interests. Information sharing is controlled by the user.

Service Manager: Allows users to broadcast their services and discover other services in the vicinity

Application Sharing/Deployment: Gives user the ability to share applications. Applications can be propagated and deployed with one click.


alphaWorks : Socializer