I believe the term "dynamic" gets a bad rep, because of many reasons.

What we do for our clients, is build the website where they can maintain the text on each of the pages from an admin area. So if they want to update the About us page, they simply login, type in their text and hit save. This information is saved into the DB and on the visitor's side of the website, the new content is pulled directly from the database. No querystring, no muss, no fuss.