Amazon and Rackspace customers need to install the software themselves (for now). The other listed hosts have made it one-click simple without the customer having to install anything. A couple announcements from major hosts today:

Dreamhost: http://dreamhost.com/dreamscape/2013/02/26/cloudflare-railgu... Media Temple: http://weblog.mediatemple.net/2013/02/26/the-web-just-got-fa...