I love WordPress, but I keep my eye on Drupal. Actually, I keep both of my eyes on Drupal. Drupal 7 is a big deal. There is lots to check out, lots to learn from, and lots that’s different.
I seriously have a goal of building a site in Drupal (that’s the only way to get a real opinion) but haven’t had the chance quite yet. Needless to say, Drupal 7 (or later) is going to make that experience that much better.