It wasn't Joomla - it was a CMS called ComicsCMS. I have deleted it, according to dreamhost, but it hasn't actually been deleted, and when I try and install Wordpress, it tells me there was an error because there are already files there.
However, I realised that I could still log in with the tiny 'admin' button on the site and delete it there as well. Except it's not deleted - I've cleared the cached and it still keeps coming back!
Dreamhost is not showing it in the list of one-click installs. It is still showing it in my list of domains (as it should), and in the SQL database.
Site is: http://www.ariadnecassmaran.com/[hr]
Oh and in response to your other question - I;ve had the domain name for a while, but set up Google Apps on it about four months ago. I did just have a site address forwardgin to somewhere, but wanted to build a proper site. I have a number of sites hosted using Wordpress which work fine, but I thought I'd check out this alternative CMS. I installed it, realised it was in no way user-friendly, and so decided to uninstall it. I did so, from the one-click install part of Dreamhost, and it said it had successfully installed. But it's still there.