Search Engine Land - Search Engine Land

In case you hadn't heard as of yet, Yahoo discontinued the Overture keyword tool. It appears they want you to use their Site Explorer tools instead:
Yahoo Officially Discontinued The Overture Keyword Suggestion Tool

SEOBook - Rank Checker Tool for Firefox

Handy open source rank checking tool created by SEOBook, access from your Firefox browser. Check out the advanced features available:
Rank Checker Tool for Firefox

Netconcepts - SEO Title Tag 2.1.3 for WordPress

Nifty plugin tool to SEO your title tags in WordPress:
SEO Title Tag 2.1.3 for WordPress

Wordpress Crawl Rate Tracker Plugin and SEO Meter Tools

Hamlet Batista passed along these cool tools for tracking crawl rates:
BlogStorm - Wordpress Crawl Rate Tracker Plugin
and
SEO Meter

SEO Chicks - Yoda’s Ultimate Tool List Part 1: Competitive Research

Good article about tools used for competitive research:
Yoda’s Ultimate Tool List Part 1: Competitive Research

SEOBook Tool - SEO for Firefox

Cool tool created by SEOBook for Firefox. This extension shows all sorts of SEO information available when searching. Toggle the application on and off as needed:
SEO for Firefox