Which models and behaviors are underlie the way how research and information retrieval are organized on a scale of international dimension. Each of us is daily confronted to search engine within framework of its activity. These new "libraries" of the Internet rest on logics of classification of the documents very distant from those in our traditional libraries. These new intellectual technologies allow informational discoveries which will change, after a creative process, in knowledge. New practices appear, which use the serendipity like explicit additive of research. The constant interaction between these new practices and these new logical organization of information makes emerge and makes it possible to characterize new contents.