This guide on competitive intelligence resources on the web was first published in 2005, and I have continued to edit, revise and update it over the course of 16 years. My objective is to provide researchers with a current, well vetted, reliable, actionable subject matter specific pathfinder on a wide range of sites and services to assist in the delivery of outstanding customer service. Seasoned researchers, law librarians and knowledge managers routinely use free or low cost value added and content rich sites as components in the delivery of more robust and comprehensive work products. This “Best of the Web CI Guide” seeks to engage researchers with topical search engines, portals, government sponsored and open source databases, news and topical alerts and data archives, as well as academic, corporate and publisher specific services and applications. The sites I have included are benchmarks for internet search and discovery, monitoring, analyzing and reviewing current and historical data; news; reports, analysis and commentary; statistics; and profiles on companies, markets, countries, people and issues, from a national and a global perspective. My recommendations are accompanied by links to trusted and targeted content and sources produced by reputable media and publishing companies, businesses, government organizations, academe, IGOs and NGOs, and expert legal and technology professionals.