Just got this email:

Hey Happy DreamHost Content-Managing Customers!

Just in case you don't get the newsletter, or don't like it, 
we're also announcing the fact that there's a new one-click 
install here:

     https://panel.dreamhost.com/?tree=goodies.installer

It's "Mambo" (see http://www.mamboserver.com/), the hugely 
popular open source CMS software.

Yippee!
The Happy DreamHost One-Click Announcement Team

I’ve heard good things about Mambo from a friend of mine who uses it to manage a gaming clan site, but I’ve never played with it myself.