I would agree that WordPress and MT are definitely the leaders, but I would have to argue the point that
WordPress will come to be the de-facto choice in the world of self-hosted personal weblogs and low-end webhosting “value added” package. MovableType will be the blogware of choice in the corporate blogging world, both for internal weblogs and those that face the outside world.
Other than the ability to pay Six Apart for support, I don’t see what advantages MT has for the enterprise market. Numerous companies will arise to meet the need for WordPress support as long as the software continues to gain traction.