Electronic Commerce

Start with 10 Great Alternatives to the Google Keyword Research Tool for a list of free and fee-based tools. For extensive keyword search statistics, KeywordSpy and KeywordDiscovery offer paid subscription services as well as a free trials.

A good overview is Optimizing Your Website: Ten Powerful SEO Tools by TJ McCue. Other useful SEO resources are:

• 100 Web Tools (Search Engine Genie)
• 211 Link Building Articles, Blog Posts, Webcasts, Presentations and Columns (Eric Ward)
• 7 Small Business SEO Strategies And Ideas (BuildFire)
• The Beginner's Guide to Search Engine Optimization (SEOmoz)
• The Customers Guide to Ethical Search Engine Optimisation
• Free SEO Website Audit Tool (Linchpin)
• Search Engine Optimisation Tools (Just Search)
• Search Engine Optimization Tools (SEO Book)
• SEO 101: The Basics (and Beyond)
• SEO Chat (includes section on SEO Tools)
• The Ultimate DIY SEO Tutorial (Step by Step) For Beginners
• The UnFair Advantage Book On Winning The Search Engine Wars
• Top 8 Free Web Statistics Tools

Blogs worth following:

• Get Elastic
• GoodROI Internet Marketing
• Michael Gray: Graywolf's SEO Blog
• LunaMetrics
• Search Engine Journal