Fotiman - 6:10 pm on Feb 10, 2011 (gmt 0)
Wordpress, Joomla, and Drupal are the top 3 CMS options today. I've used all 3 and, and honestly I'm surprised that Joomla has a larger install base than Drupal (Joomla was my least favorite because it had a lot of tables for layout built into some of the core pieces... granted, that may have changed since I last used it). I think for commercial grade products, any of those 3 are great options.
Drupal 7 was recently released. I don't have any experience with it yet (I've used Drupal 6 though). I would say the future of Drupal is solid (if you're concerned that it might go away).
Glad you posted this because it lead me to look up some of the numbers and seeing how popular Joomla is, I think I'll need to evaluate it again soon. :)