[discostrings]

Most sites aren't web apps--they're content-based, with text, pictures, and links. Progressive enhancement makes the most sense for the majority of content on the web.

Web applications are certainly useful in some contexts, and progressive enhancement may not be the best approach if your application requires a lot of extended interaction. But building a web app to display primarily text- and picture-based articles and documents is misguided, and it does web users a disservice.