In my random quest to master various parts of the web, I have discovered Joomla, a startlingly beautiful CMS. So I'm putting together a package for my kid's local Scout troop and seeing if I can make a go of this as a side business.
Joomla is massively configurable, an order of magnitude more sophisticated than Drupal. And yet it is so well designed that although it looks daunting at first, it's fairly simple to use. I have gotten lost a few times in Drupal, especially when putting together custom content types, but Joomla presents no such problems.
That said, they have different approaches and seem suitable for different scales and types of applications. This will be my fifth CMS starting with Userland Radio. Post-Nuke that I used over at Cubegeek was the second I learned. MovableType we all know and love. Drupal is very cool and Joomla makes five. I see Joomla as best suited for an organization that makes formal announcements to a large audience. It's not so much a community-driven portal as Drupal in that it gives a great deal more control over what gets pushed out to the site, in what categories and what format.
Here's a link to the sample site for the Troop in progress. Check it out.