Collaborative advertising over Internet with agents

We discuss an approach to advertising over Internet using software agents. The agents represent users of mobile devices and service/product providers. The user agents autonomously analyze advertisements by cooperation and negotiation with provider agents and notify the user when interesting offers are found. Notifications and offer descriptions are sent using e-mail, SMS messages and WML-pages. Agents may form coalitions for collaborative work such as co-shopping and co-advertising. A prototype implementation of the discussed advertising service is performed using the Agora environment for support of cooperative work in multi-agent systems. Basic features of the environment are briefly discussed