Movable Type 4

I now use Movable Type 4. Below is what they write about the new version 4.0. 

This
is the biggest release of MT ever, a complete redesign of both the
front end information architecture and the back end scaling
infrastructure. The dozens of new features have been inspired by the
outpouring of community support have helped inform our efforts: MT4
reflects what all of us have learned about how blogs work and where
blogs are going.

Movable Type 4 has an incredibly broad set of new capabilities, but here's an overview to whet your appetite:

• A completely redesigned user interface. The first
  time you log in to MT4, you'll be greeted with a graphical display of
  blog activity, a customizable dashboard, and even more powerful ways to
  manage an unlimited number of blogs all in one place.
• Vastly more powerful publishing abilities. There's
  new support for standalone pages in addition to your blog entries, much
  more robust templating including warning messages if your templates
  contain errors, and smarter archiving with the ability to create
  archives per-author or category archives paged by month.
• Better plugins, with many built in. Many of the
  most popular plugins from our community have been folded into the MT4
  core, and dozens more plugins are either upgraded for or brand-new to
  MT4. The things you want to do with your site, from tagging to
  podcasting to managing your media and files doesn't require you to
  install or configure any complicated plugins.
• Even more MT-only innovations. Cutting-edge
  identity technologies like OpenID are built right in, and nicely
  complement MT's built-in user registration. And MT's powerful
  permissions system is complemented by a robust set of
  fully-customizable permissions, so you can choose exactly what each
  member is allowed to do.
• Unique features. MT4 keeps the tradition of doing things that you can only
  find in Movable Type: powerful support for an unlimited number of
  blogs, with the ability to aggregate content from one, some, or all of
  your blogs in a single page. And the ability to add on solutions to
  your core MT install to enable Enterprise integration or advanced
  Community features.
• The best documentation in the business. MT4's
  documentation has been rewritten from the ground up to focus on the
  tasks you have at hand. And the Six Apart Guide to Business Blogging is
  over 75 printed pages of information on how to help your company make the most of blogging.
• Dozens more features. We've got an exhaustive list
  of just some of the exciting new improvements in MT4. From better
  typography to the upcoming Open Source release of MT, there's something
  for everyone.
• A reinvigorated community. Hundreds of thousands
  of you have joined us on the journey through the beta versions of
  Movable Type, by submitting bugs, downloading test versions of the
  software, reading up on the new features and documentation or by trying
  out demos. And the community has helped create the fundamental
  resources for this new version: movabletype.org, the home for the MT community, the new Movable Type Plugins Directory, and all of the exciting new plugins made specifically for this new version.