This looks great. I recently went through the decision making process with a client and they settled on getsatisfaction for now but would probably love something like this.

I'd be interested to know how they came to the decision to use Rails. The goal here seems to be an application that is easy to deploy across PaaS/IaaS platforms such as AppEngine (no Ruby support atm, mentioned on the website though), AWS, Heroku as well as self hosted/installed.

All the apps in this space (behind the firewall, self-installed) to date have been either PHP (Wordpress, PHPBB, SugarCRM etc.), Java (Atlassian, Jive, Zimbra) or .NET (Telligent, FogCreek, vBulletin)

The only Rails app I can think of is Redmine (oh, and Diaspora).

PHP is easy to deploy while a lot of businesses are already running either Java or .Net. It may be more difficult to get Rails deployed, but then again having a simple virtualization or PaaS target could change that.