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This paper describes the origins and the historical evolution of the so-called on-line catalogs of Public Access (OPAC) and focused on the challenges of the universe 2.0 and in the transformation of the relationship between users with the information. Identifies the factors that influenced this evolution, presenting the transformations that produce both the multiplication of the media, such as the impact of the mass adoption of ICTS. Describes the universe 2.0 as a space of convergence of tools, resources, and means that interact and considers it the central cause of the transformation that is born of the requirements of the users. Expresses the need for a conversion by attitudinal and emotional part of the information professionals and libraries, on the understanding that the richness of interaction transforms both to the library from the outside inside.