Resources
Search engine optimization is hard work, but fortunately there are resources and tools out there to make specific areas of our work just a bit easier. Listed here are some must-have staples in every SEO’s toolkit. Bookmark this page! 
Keyword Research Tools
AdWords Keyword Tool (AKT) - Traditionally used for managing AdWords campaigns, the Keyword Tool can also be used to graphically numerically display search volumes for certain keywords and keyphrases.
Insights for Search - A tool that analyzes web searches from all Google domains to compute how many searches have been done for the terms you’ve entered, relative to the total number of searches done on Google over time.
Keyword Discovery (KD) - Essentially the same as WT, except that KD tracks and counts visitors differently. The overall data provided will be very similar from a broader perspective.
Search-Based Keyword Tool (SKT) - A more informative version of the AdWords Keyword Tool - both are developed by Google. Further details can be found on this post.
WordTracker (WT) - "Wordtracker helps website owners and search engine marketers identify keywords and phrases that are relevant… and most likely to be used as queries by search engine visitors."
Webmaster Resources
Markup Validation Service - Created by the World Wide Web Consortium (W3C), this tool is used to check for valid document markup such as HTML, XHTML, SVG, and more.
Google Webmaster Tools - Formerly known as Sitemaps, Webmaster Tools shows how Google crawls and indexes your site and any problems it encounters. There’s also data on internal/external links, top search queries, and SERP positioning.
Yahoo Site Explorer - Essentially Yahoo’s version of Webmaster Tools.
Live Search Webmaster Center - Microsoft’s version of Webmaster Tools / Site Explorer, designed specifically for the Live index.
Analytics and ROI Tools
Google Analytics - A web analytics resource with very detailed information regarding visitors, traffic sources, and content usage.
IndexTools - Recently acquired by Yahoo (April 2008), IndexTools is a web analytics platform that currently surpasses Analytics in terms of being integrated with paid advertising campaigns.
StatCounter - Its mission is "to help [its] members easily understand their visitors, so [that] they can make good decisions to become more successful online."
Miscellaneous Tools
SEOQuake - An extension for Firefox or Internet Explorer that displays anything from cache dates, PageRank, the number of indexed pages from Google/Yahoo/Microsoft, and Alexa rank.
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I also just got special ‘newyear gift’ form...
