Ready Set Rails is running PHP? I'd think that a site promoting Rails and a Rails workshop would be, you know, using Rails. :-)
But to keep it a part of my normal Rails workflow, I'm running WP on Heroku (http://decielo.com/articles/350/wordpress-on-heroku-up-and-r...), and using it with Pow locally. :]
That config stood up to HN traffic quite well on the one free dyno from Heroku.
But, wow, that configuration deserves an HN traffic spike recap blog post!