SEO - Ensure content is bookmarkable

Going through the web, for many reasons, web sites will break navigation (either through one big flash animation, englobing the site in a frame or dynamic loading through AJAX).

Yes engines such as google bot will find it but this is bad for SEO and traffic for several reasons:

I understand that in some cases, it might not be an option (example no control over content generation) but still try to have a way to actually navigate straight to the content.