Search Engine Optimisation

SEO Checklist

Do add brief descriptions to the alt attribute of image tags. The attribute should describe the image, not be a summary of the article.
Do use H1, h3, and H3 for titles and headings.
Do create a relevant HTML title for every page. Using the actual article title that appears in the page is a good idea.
Do use style sheets as much as possible to keep the page size low.
Do use brief and relevant meta tags (keywords and descriptions) to provide a backup for the description that appears in search engine listings.
Don't fill the meta tags with words that don't appear in the content of the page. The exception to this is to put common misspellings in the meta tags.
Don't repeat meta tag content on every page. The content should be specific to the page.
Do create separate sites rather than making a site a sub-site of a larger one.
Do not make every visit to a URL unique by appending a session ID or something similar.
Do create a site map. This is as much for users as for search engines as it can serve as a gateway to deep content.
Don't link to redirects. Better to link directly to the destination page.

Don't create images that contain only text i.e. if an image contains just text, consider using HTML instead.
Don't put content in Flash movies. Better to have the content outside of the Flash and in the HTML.
Do provide a transcript for video or audio interviews.

Do create a title that uses words that describe the main theme of the article.
Do use headings and sub-headings that describe the main theme of the copy that follows.
Don't automatically swap out repeated words and phrases in favor of less common words and phrases.
Do post all content on the web site including newsletters.
Do keep all special content such as Christmas, Halloween, Thanksgiving specials on-line.
Don't use pop-up windows for content. If pop-ups are necessary, provide an alternative link to the same page that isn't a pop-up.
Don't remove content from a web site.
Do make sure all content, in particular old content, has a link pointing to it. Use a site map or archive list page if necessary.
Do allow search engines to view forum discussions. This is free content.
Do update content as often as possible. Search engines like frequently updated sites and will visit more frequently.
Don't worry about writing articles that are too long. The longer the better when it comes to SEO.