EN
Besides knowing the differences between search engines and resource guides, it is useful to be familiar with the content selection criteria used by library resource guides. This article focuses on the selection guidelines of the well-known Librarians' Internet Index, primarily serving the needs of public libraries. Two new services are also presented: Intute, a British academic resource guide is a representative of a new generation of integrated resource guides, while WorldWideScience.org is not exactly a resource guide, but a free global science gateway that enables searches among selected sources.