Textpattern: web writing tools. The
Textpattern: web writing tools. The first selling point mentioned is ease of use. The second is categorization: "for a start: all the elements that make up a site published with Textpattern code, layout, and content are subject to a rich system of cross-categorization"
The categorizing capabilities offer a fixed set of facets: Category, Section and Linkcategory, in which you can create your own topics/categories. Weak points: no hierarchy, no self defined facets. Tip: if you are building linkcategories yourself, use Claire Harrison's link classification as a starting point. Here's another review, and another one.
Textpatterns has a host of clever features (other than the somewhat dissapointing categorization - better than anything out there right now, but still dissappointing): easy widgets for creating templates (I could see myself doing a good template in Textpatterns, as opposed to one in this site), the very clever See All Comments In One Place per writer, built in Visitor Logs and so on.
I won't be switching soon because there seems to be no overriding reason for me to do so (the categorization capabilities aren't that much better than MT, the ease of use isn't that much better, and it's unproven) I would recommend Dean to focus on one underserved area (Hm, categorization?) and make that really irresistable (while matching all the general functionality we have come to expect from tools like this - including search).