Making a pun on the post title: Every programmer is on a long, cyclical journey where every stepping stone feels like a new kind of enlightenment. Blogging allows them to share their brilliance with the world, showing how they are surely amongst the first to attain their new level of purity and zen. -- peteforde on HN
More examples? It should use nice-to-write DSL with CSS/jQuery like selectors, and be able to "compile" templates to PHP inlining the dynamic code (like querytemplates is doing). There should be no special syntax in HTML, except template inhertiance (master page) if no better option exists.
I like the name "template animation" (name by Iain Dooley) for doing this, even it is very bad for SEO. It sounds more fun than non-obtrusive HTML replacing others are talking about. In fact it is not just replacement, it is generation, conditionals and else. "Mockup-driven development" (name by judofyr on HN) is not bad as well.
Parsing XML documents with CSS selectors looks very useful.