Not the dance; the CMS.

I am setting up some sites using it, and as I dug in, I found some of the generated html code to be - as I described to my client - hideous. (Sorry Mambo guys... just not my style.)

But, I hopped online and posted my woes to their forum, and got a really good answer back. What I would change is something core to the system, which would mean everytime my client would update their Mambo installlation, my changes would get wiped out. But they planned ahead, and allowed a way for me to keep such custom files safely tucked away in the template folder. Very cool. Nice work Mambo guys!