I blogged last April about the idea tha del.ici.ous might work as a means of creating categories, that could include inherited catgories, and that by adding such links the non-hierarchical taxonomy could just evolve from the links.
I noticed on a search cross-hit that Greg, John and Fritz at Freshblog had a detailed summary of ways to exploit del.ici.ous for this purpose. Must follow-up this idea.
Categories was the only reason I moved from Blogger to WordPress. Would I switch back to blogger if I fixed this ? The Swicki (in the header) is part of my experimenting with informal / evolving categories.