Wordpress on Heroku?!
It works. Even better than Dreamhost, if you need to host a blog.example.com separately from the rest of www.example.com.
Just make sure to install your themes & plugins manually, then push to Heroku, as Heroku doesn't have the necessary zlib extensions.
This repo contains WP 3.6, the score.lataweb.com custom theme, and the wp-importer plugin.