Top 10 SEO Tools for Small Business Websites

1. Google analytics (from Google) – this is what you can use to track clicks, traffic, visitor behavior, etc. You can gather this info to make sure campaigns are on target. This tool can also give you an idea of how Google sees your site and keyword distribution: http://www.google.com/analytics/.
2. Google search tool (from Google) – the bread and butter of any SEO operation. This tool is to do research on potential keywords by getting estimates on keyword traffic for SEO and PPC campaigns: https://adwords.google.com/select/KeywordToolExternal.
3. Google webmaster tools (from Google)- this tool analizes website metrics and can alert website owners of potential problems with things like broken links, errors, whether the Googlebot can even read your site, some of the back-links to your site, unique meta tags, etc.: http://www.google.com/support/webmasters.
4. SEObook toolbar (a Firefox add-on) – this is a toolbar where you can see page rank, number of links, cache dates for the Googlebot, etc. you can use this to find out what your competing sites are doing and how competitive your environment will be before you start your SEO efforts: http://tools.seobook.com/seo-toolbar/.
5. Rank Checker from SEO Book (a Firefox add-on) – this tool is where you can put in multiple keywords and check rankings of any site in Google, Yahoo, and MSN. This is pretty important because you can't do this by hand very quickly and if you use some of the automated software Google will "kick you out" and suspend your search capabilities (for about 4 hours) to prove you are not a computer sending automated queries: http://tools.seobook.com/firefox/rank-checker/.
6. Open Site Explorer (from SEOmoz) – this is a free tool to get an idea about the links which are being associated with your site. You can also use it to look at competing or similar websites to get an idea of who they are linking to and link building strategies: http://www.opensiteexplorer.org/.
7. Linkscape (from SEOmoz) - similar to open site explorer which gives general info about link architecture: http://www.seomoz.org/linkscape.
8. Yahoo Site Explorer (from Yahoo) – a back-link analysis tool which lets us know exactly which links Yahoo associates or credits to a particular site. (Google doesn't do this but only gives you a few from webmaster tools!): https://siteexplorer.search.yahoo.com.
9. Google local business listing tool - a tool which gives synonyms for categories for Google Local Business listings: http://www.blumenthals.com/index.php?Google_LBC_Categories.
10. Bad Neighborhood link checker - a tool to check to see if you have any links which are considered to be in a "bad neighborhood," which could potentially counteract your SEO efforts: http://www.bad-neighborhood.com/text-link-tool.htm.