The article's title is "Redesign: From PHP/MySQL to Node/MongoDB Stack". And isn't about going from PHP/MySQL to Node/MongoDB at all. Instead it's mostly about putting together a one page app sort of thing, rather than putting everything together server side.
Looks very nice, and the fact that it changes the URL when you click on a link is awesome. I didn't even know that was possible now. I wonder if the server delivers a different page for different URLs (for search engines / older browsers).<p>Also it feels very snappy, but I wonder how it works under less favorable conditions (slow computer or connection).