WordPress MU

Please post links to all NOT WPMU-based popular blogging sites.

Like http://www.blogsource.com/ - which has this really basic interface (No categories, for example, you write a post and you have Title, Post-content and Tags, and allow/disallow comments, and that's it, and the editor's like WP's non-TinyMCE with fewer choices).

The reason I'd like to know about such alternatives is, to be honest, to "borrow(?)" ideas on how to make WPMU simpler to use, plugins that could be done, etc.

If it isn't MU, it might as well be this.