I suppose it's a litte ungrateful to say this two days after category support arrived in version 5 of Blosxom (or whatever it really is in Rael's strange version numbering system). But it's still true ... you should be able to put Blosxom entries in multiple categories. Here's a great example: this entry could reasonably fit into several other categories (Computers/Internet/Blogging because it deals with Blapp, Computers/SoftwareDevelopment/Methodologies because it deals with bazaar-style development, Computers/SoftwareDevelopment/Tools because it deals with GUI builders, Computers/SoftwareDevelopment/Interfaces because it deals with inherent problems of GUI development ... you get the idea).

I understand the need to have a primary category, but secondary categories wouldn't have to reflect the disk storage model.