Addwise Specializes in information architecture and usability evaluations. http://www.addwise.com/

Amichi Chicago based knowledge management and web design firm that specializes in metadata creation and interface design. http://www.amichi.info/

Apperceptive With close to 10 years in the interaction design field, Sean brings a communication design and narrative flavor to designing information architectures and user interfaces. http://www.apperceptive.com/

Argus Center for Information Architecture Reference for learning about the theory and practice of information architecture. http://www.argus-acia.com/

Heyotwell.com Daily links to information architecture, user-centered design, and interaction design resources. http://www.heyotwell.com/

Boxes and Arrows Journal dedicated to discussing, improving and promoting the work of the information architecture community. http://www.boxesandarrows.com/

Cardsort.net CardSort supports Information Architects to conduct computer aided Card Sorting. http://www.cardsort.net/

Dynamic Diagrams We help people understand information. Demanding clients around the world trust us with their thorniest information analysis, design, and communication challenges. http://www.dynamicdiagrams.com/

Enterprise-Architecture Information about standards, methods and tools for Enterprise Architects and conference agenda. http://www.enterprise-architecture.info/

Hey, Hey, IA! One-stop information resource for information architects. http://www.heyheyia.com/

Hierarchy Science Principles of the creation of effective management systems: overview, experiences on introduction and development. http://www.ironya.com/

Iaslash News forum for information architects. http://www.iaslash.org/

IAwiki A wiki dedicated to the topic of Information Architecture. http://www.IAwiki.net/

Melissacook.com Specializing in information architecture development for Fortune 1000 companies and federal and state governments. http://www.melissacook.com/

Info-architects Mailing List Central repository for information architecture on the Web. http://www.info-architects.net/

Infoark.co.uk Using the latest automated software tools, we work with you to categorize, link and filter the content you. http://www.infoark.co.uk/

InfoDesign Dedicated to the growth and improvement of the information and experience industries through the provision of a centralized online resource. http://www.informationdesign.org/

Information & Design Consultancy based in Melbourne, Australia provides usability, user experience design and information architecture services. http://www.infodesign.com.au

Information Architecture Examines IA as a newly developing profession. Features a glossary, techniques, methodology, and contact information. http://www.information-architect.info/

Jason Hobbs: Information Architecture Articles about IA and the WWW. Written from the day-to-day experience of building and living online. http://www.jh-01.com/