SEO Tools and Applications Useful for Responsible SEO Strategies

Free SEO Tools - Information is Power

• Broken Link Checker
  Check your web site structure for any broken or outdated links
• HTTP Headers Viewer
  Viewing HTTP headers is very helpful for testing 301 redirects
• Google Webmaster Tools
  Great site management and search engine analysis tools for Google
• Yahoo Site Explorer
  Yahoo! tool for managing your web site activity with its search index
• Link Popularity Comparisons
  Compare link popularity between different web sites
• Create Sitemaps for Search Engines
  Create site maps XML Sitemap protocol, HTML, text files and more.
• SeoDigger
  Produce a snapshot of current keyword phrase rankings. {BETA}

Become SEO Knowledgeable - Recommended Reading

• Search Engine Marketing, Inc.: Driving Search Traffic to Your Company's Web Site - This book with make you an expert. The definitive guide on SEO and Internet Marketing in General. Very solid book full of accurate and important information.
• Search Engine Optimization - Long time web developer, Lynda Weinman, tackles SEO. This book is excellent for understanding SEO in its complete process.
• Professional Search Engine Optimization with PHP: A Developer's Guide to SEO - For those who "just want the facts", this book delivers. Straight-up, no-nonsense approach to SEO.