This is quite a difficult topic for me to answer, as I tend to include links to my websites. The Fit to Talk project is one example. I think if a post is being made just to promote a website that is owned by the poster, and the site is not of benefit to Bitcoin Talk or its members, then the post should be deleted.

Other sites such as domain name sales lists should be included in the posters signature, rather than be included in the body of the post. However, there can be instances where an article written by the poster may be of interest to the members, and be relevant to the thread. I think action should be taken if the poster is just using Bitcoin Talk to promote his site, and not making other contributions.