I found a new software that creates a blog on your iDisk (obviously for OS X users). It's called iBlog. I don't really like the feature set, the the usability is poor, and the sole template is ugly. But, I love the interface.
I would love it if someone created a similar interface that worked with a number of blog softwares. I know the Blogger API is available, so that is doable. I'm not sure about Radio or Movable Type, but I'm sure it's possible. Anyway, if you know a programmer or if you are a programmer, then do it.