There dozens of good sites that have helpful tools for search engine optimization and search engine marketing. Some of the links we provide offer competing services at lower prices. We have no issue with providing these links for educational purposes only. A better educated client makes our work easier.
We do not specifically recommend or have authenticated the information contained on these sites so conduct your own due diligence. Like anything on the Internet there are nuggets of truth and value mixed in with the hype.
Worth a Visit
Website 15 Point Checklist and free SEO tools - Interesting approach to weighing in on the most important factors for good HTML page design. The point system emphasizes the relative importance on each SEO technique in this authors mind.
Wayback Machine - Before you buy a domain name you should check and see if there was a website at that address in the past. This is important because if the previous website was banned from Google and Yahoo or had been used for SEO black hat tricks, your new site could be penalized.
HTML Validator Service - Every website should strive to be compliant with HTML programming standards. In theory, a website that is 100% compliant would be preferred by the search engine web-bots. This free tool can check any page on your website to see if it is programmed with standard HTML syntax. Errors should be reviewed and corrected by your web designer immediately.
Digg - If you have compelling original content on your website you should consider creating an account on Digg and submitting your articles to their directory. If your articles are well written and on a point that interests readers, it can create value links and traffic to your website.
Ezinearticles.com - If you like to write and can craft interesting original content about your business or line of work, consider submitting your writings to this website. We have found that articles posted on this free listing service creates links that are picked up by Yahoo and Google.