What?  Is it possible that even experienced SEO experts can make a mistake?  While it is not often that expert SEO specialists make mistakes, it does happen.  Here are 10 mistakes that are hard to catch—but they do result in lost traffic and bad SEO campaigns.

1. Failing to redirect users to a similar address

Canonicalization issues can cause connection problems.  For example, http://www.domain.com and http://domain.com do not always have the exact same address.

2. Splitting links

All internal and external links should go to the http://www.domain.com address rather than a default or index page.

3. Creating a couple of pages with too many keyword phrases

Too many webmasters and SEO experts try to optimize a few pages by stuffing too many keywords into one article.  When this happens, it compromises the quality of the article.  Instead, try to create a series of individual pages with one keyword each.

4. Failing to network with peers

Rather than remaining ultra-competitive, try to cater to influential bloggers and other sites that can help you.  You have plenty of products to offer—your links, your images, your articles and videos.  The more links you receive, the better it is for everyone.

5. Failing to optimize RSS feed text

Failing to optimize the text in an RSS feed, just the same as you would with individuals posts and pages.

6. Does not work with images

Rather than mindlessly posting images all over the site, write ALT image attributes text, as well as captions.  This is an area of SEO marketing that is often ignored.  In addition, pay attention to the context surrounding your images, as search engine editors often scrutinize these paragraphs.

7. Does not check server headers

Webmasters and SEO consultants should be careful to check server headers to ensure that their URLs report a “200 OK” status.  A “301 Moved Permanently” status is also acceptable.  Anything else could result in display problems.

8. Adds Flash, Ajax or frames content to the site without any thought to conflicts

These tools make it difficult for one to link to a single page.  Frames are highly discouraged by the community, and even Flash and Ajax users are cautioned to use these tools infrequently.

9. Failing to make the page come alive with videos

Do not be content with YouTube clips.  Check out other video sharing sights like AOL, MetaCafe and MSN.

10. Misestimating domain issues

It’s recommended that you buy up all similar domains to your company’s primary name in order to protect yourself from plagiarism.  In addition, choose a domain name that ties in well with your product and company objectives.