I've been using Joomla! for some time now and I've gotten quite comfortable with it. Recently I've been helping August's cub scout pack, a neighbor and close friend build web sites using Joomla! and I've gotten pretty competent with it.
I branched out a bit and used Concrete 5 for my johnwargobooks.com site. It's pretty cool - it's more of a web based site builder than a true CMS like Joomla and Drupal.
I've setup domains for my new PhoneGap book, PhoneGap Essentials, and another site I wanted to build. For these two new sites, I've decided to build them using Drupal 7. I'm excited to get started working on the sites; as soon as I finish writing the book (which should be by Christmas) I'll start working up the book's site and let you know when it's up there.