SEO TOOLS AND LINKS:

• Matt Cutts' Google / SEO blog. Great source of updates and information from this friendly, well-respected insider and Google search and spam guru.
• Google Webmaster Tools blog. A forum for announcements from the folks who run Google's webmaster tools.
• Webmaster World's Google News forum (free registration and login required). Discussions of all things Google-related between webmasters worldwide, and an excellent place to pick up tidbits of advice and observations.
• SEO Roundtable's Google Web Search Forum. Another well-respected source of information and updates about Google Search.
• Google Sitemaps/ Webmaster Tools (free registration and login required). An incredibly useful set of tools for webmasters, providing a wealth of information on how sites are seen by Google (including performance statistics, error reporting, and more).
• Google Adwords. Access to Google's Adwords system for those who have (or are interested in) pay-per-click advertising with Google.
• McDar DataCenter Watch tool. A handy way to test keyword performance across a wide range of Google's many datacenters. Some conjecture that this is one way to forecast updates in Google's search algorithm.
• DNS information from DNSStuff. A great source of information about domain registration, spam records, etc.
• Digital Point keyword suggestion tool. This tool shows Overture and Wordtracker results in the same place, making it a nice, comprehensive source of information on which keywords are used most by users.

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• Overture search term suggestion tool. Overture's keyword suggestion tool uses Overture/Yahoo! search data.
• Digital Point keyword tracker (free registration and login required). Set this tool up to track your ranking on major search engines for any keywords you choose.
• Backlink analyer and other tools from SEO Book's Aaron Wall. A host of handy tools and links.
• Marketleap Link Popularity Check. Checks backlink counts from several major search engines simultaneously.
• Links to rankings and market share diagrams for major search engines from Search Engine Watch. See data on how the engines are doing, and by extension where people are going for their information.