I'm not a fan of Drupal or Joomla very much, and they both used to be full of security holes. I haven't really been keeping up, so, I'm not quite sure if they still are, but I know they were very slow to actually get around to patching them. WordPress has always seemed speedy, and I'm quite fond of their development and philosophy. For those of you that think WordPress is slow, I'd wager that you're either running poorly programmed plugins for it, are set up on an underpowered machine, or haven't tried it remotely recently. I think it's an excellent piece of software, and in my opinion, it blows every other CMS/Blog platform (that I've seen/used) out of the water. I'd invite anyone who hasn't tried it to do so, and anyone who thinks it's slow or poorly programmed to scrutinize their setup.