[lotyrin]

Yeah, but in most of those cases, it's as easy as get the author based on a key from his content.

It's only when you want joins (e.g. give me all of the titles of all the content and their author's information at the same time) that things get hairy.

Agreed it's not always going to be true for many CMSes. I meant it as a particular CMS, not the general class of CMSes but didn't make that clear at all.