A blog for all marketing, advertising, branding, market research related news, knowledge and other interesting information.

Resource by Rand Fishkin, with weblog, articles and free tools. Includes a beginner's guide, an online exam and recommended firms.

Provides web site promotion suite for a monthly fee. Includes email marketing, banner impressions, and search engine submissions.

Interactive advertising agency specializing in the design, development and marketing of media. Services, company, and contact information.

A directory of optimizing firms and marketing firms.

Lists website optimizing companies worldwide by country, US state, and language. Add and review services.

A non-profit professional association offering case studies, articles, events and comprehensive directory of search engine marketers.

Organization of SEOs and marketing consultants developing and implementing a set of best practices for the search engine optimization industry. Includes a database of consultants, consumer tips, SEO skills sets and complaint registry.

Specialized internet promotion and press release services for high-end web site launches.

Reviews and comparisons of the top search engines with free online tools to help optimize your website.