Some technology actually stops search engines from listing the content on a web site and your browser from viewing the content. Review your pages or if you are planning new pages, consider whether having any of these search engine blocking technologies is worth it. The effects of some these technologies might be nice to look at but that can be a two edged sword when it comes to receiving a page rank and being indexed with cheap dedicated servers.

Affiliate Links

Sites with affiliate links and that do not have original content are becoming banned by search engines. The problem is the duplicate content and spam. Affiliates will have to become creative and may have to resort to finding original content instead of the rewrites.

Databases

When a server provides database results, the search engine cannot view them because it is dynamic.

Directory Hierarchy

Keep your important content in the root level of your website because search engines do usually not see content that is buried deeper than three or four directories.

Dynamic HTML

Most search engines cannot search or index dynamic pages.

Flash

Flash has a few downsides. Trojans and viruses can infect other computers though the Active-X required to run Flash. Search engines cannot read either Flash navigation buttons or Flash presentations. Even some visually impaired persons get ill after seeing Flash animations. Flash also is a slow load technology and many visitors will stop the flash or leave the site if there is flash on it.

Forms

Search engines cannot search forms because they are unable to fill them.

Frames

The content within a frame is not searchable to a search engine. Provide the content in a non-frame version if possible.

Host Pages

When you use a free web page from an older company, many of the templates have an excess of coding including errors. Search engines will not search or index these sites.

Images

Do not have any important information in a graphic because the search engine cannot read it. You can keep your text in the logo if you make the information available somewhere else on the same page.

Image Maps

Search engines have a hard time with the links used in an image map and will avoid them. Provide conventional links on the same page.

JavaScript

Search engines cannot read links placed inside of JavaScript. HTML links should be placed on the same page.

Large Pages

Go for a page about 40 K because any bigger and the crowd will go elsewhere because of the slow load time.

Multimedia Files

If there is spectacular text in your media files, the search engine will not search or index it.

Password Protected Web Sites

Search engines cannot use the pages without a password.

WSYWIG HTML Programs

When you use a program that lets you create a website without any previous knowledge of HTML, the page you create with the software will have so much extra coding and error in the coding that the search engines will not search your page. Lucky, there are online validators to check your code for errors.