Here are some links to some of the best free and pay SEM/SEO tools and information.

Wordtracker (wordtracker.com) - Pay Tool for automated keyword generator.

PR Prowler (pr-prowler.com) - use to check on your online competition.

WebFerret (download.com/WebFerret)- to find websites with similar interests and are industry related use the CNet's free tool WebFerret.

WebCEO (webceo.com) - get the free WebCEO SEO download, they have a free and pro version, and it is one of the best SEO tools around.

SitePoint (sitepoint.com) - check out SitePoint for free and pay SEO resources, and a good newsletter.

SiteProNews (sitepronews.com) - is also a good resource for SEO information and good newsletter.