I notice that 77 people are "waiting" for a Baltimore WordPress group. Not one to wait, I figured I'd jump into the fray.
I wrote a book about Drupal, actually, but my most recent site is in WordPress, and so far, I'm enjoying the WordPress experience. (I've installed a number of WordPress sites, but http://12WeekPlan.org is the first one that is really taking off, complete with theming, people actually using the site, etc.)
Please join the group regardless of your level. No matter what your level, you'll learn more at these meetups. And please let me know if you've got some venue and/or speaking ideas.