[lstoll]

There is, it's just not officially supported: https://github.com/heroku/heroku-buildpack-php . Github lists it as having 82 forks, so people are definitely playing around with this.

[sync]

Yep. You can even run Wordpress with our fork: https://github.com/Americastestkitchen/heroku-wordpress-php/

[ridruejo]

How do you deal with uploaded files/persistent storage?

[sync]

S3. Ignore the scary warning, this plugin works great for us: http://wordpress.org/extend/plugins/tantan-s3/

[stevencorona]

Surprised it's using mod_php instead of PHP-FPM