Search engines and directories are widely used for retrieving information from the vast variety of Internet pages. However, due to differing policies, search modes and coverage, search results from various public services differ significantly in size and content. ChemGuide and PublishersGuide Internet Search Engines offer a unique combination of well-defined pre-selected Web sites with an easy-to-use database interface featuring sophisticated retrieval functions. Thus, they increase substantially the quality of Internet search results. ChemGuide and PublishersGuide offer full-text searches of all pages of the pre-selected sites on one server. Retrieved documents can be viewed within the search engine and all hit terms are highlighted on the screen.